Class 976: NUCLEAR TECHNOLOGY ( Manual of U.S. Patent Classification )

Information Products Division
[Manual of Classification, Class Listing] [Classification Index] [USPTO Home Page]

Manual of U.S. Patent Classification
as of June 30, 2000


Class definitions may be accessed by clicking on the class title, above.
Subclass definitions may be accessed by clicking on the subclass number, below.

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Subclass Title
DIG 1[Patents]ALLEGED CONTROLLED FUSION REACTORS (G21B-1/00) ** (uncontrolled reactors DIG. 423; arrangements for heating or confining plasma H05H-1/02)
DIG 2[Patents] . Combined fission-fusion reactors [G21B-1/00B] *** (see also DIG. 5+)
DIG 3[Patents] . Inertial confinement fusion reactor [G21B-1/00C] *** (plasma produced by laser H05H-1/22B; by particle beam H05H-1/22C)
DIG 4[Patents] . Using a beam of particles some of which react with other particles [G21B-1/02]
DIG 5[Patents]NUCLEAR REACTORS [G21C-1/00] *** (fusion reactors H05H-1/00; nuclear explosives DIG. 423; analogue computers therefor G06G-7/54)
DIG 6[Patents] . Integral reactors (i.e., the reactor core and the heat exchanger are placed in one vessel; the reactor vessel and the heat exchanger form an integral construction) [G21C-1/00B]
DIG 7[Patents] . . Where the prime mover is also placed in the vessel [G21C-1/00B2]
DIG 8[Patents] . . Where the heat exchanger is disposed above the core [G21C-1/00B3]
DIG 9[Patents] . . Where the heat exchanger is disposed beneath the core [G21C-1/00B4]
DIG 10[Patents] . . Where the heat exchanger is disposed beside the core [G21C-1/00B5]
DIG 11[Patents] . Fast fission reactors (i.e., reactors not using a moderator; metal cooled reactors; fast breeders) [G21C-1/02]
DIG 12[Patents] . . Characterized by the concept and properties of the core [G21C-1/02B]
DIG 13[Patents] . . . Where the core is divided into zones with fuel and zones with breeding material [G21C-1/02B2]
DIG 14[Patents] . . Cooled by a not essentially pressurized coolant (e.g., tub type) [G21C-1/02D] *** (cooling arrangements DIG. 187+)
DIG 15[Patents] . . Cooled by a pressurized coolant [G21C-1/02F] *** (cooling arrangements DIG. 187+)
DIG 16[Patents] . Thermal reactors; Epithermal reactors [G21C-1/04]
DIG 17[Patents] . . Heterogeneous reactors (i.e., in which the fuel and moderator are separated) [G21C-1/06]
DIG 18[Patents] . . . Pebble-bed reactors; Reactors with granular fuel [G21C-1/06B]
DIG 19[Patents] . . . Moderator being highly pressurized (e.g., boiling water reactor; integral super-heat reactor; pressurized water reactor) [G21C-1/08] *** (DIG. 30 takes precedence)
DIG 20[Patents] . . . . Pressure regulating arrangements; "pressurizers" [G21C-1/08B]
DIG 21[Patents] . . . . Reactors where the coolant is overheated [G21C-1/08D]
DIG 22[Patents] . . . . Boiling water reactors [G21C-1/08E]
DIG 23[Patents] . . . . Pressurized water reactors [G21C-1/08F]
DIG 24[Patents] . . . . Moderator and coolant being different or separated [G21C-1/10]
DIG 25[Patents] . . . . . Moderator being solid (e.g., Magnox reactor, gas-graphite reactor [G21C-1/12]
DIG 26[Patents] . . . Moderator being substantially not pressurized (e.g., swimming-pool reactor [G21C-1/14] *** (DIG. 30 takes precedence)
DIG 27[Patents] . . . . Moderator and coolant being different or separated (e.g., sodium-graphite reactor, sodium-heavy water reactor, organic coolant-heavy water reactor) [G21C-1/16]
DIG 28[Patents] . . . . . Coolant being pressurized [G21C-1/18]
DIG 29[Patents] . . . . . . Moderator being liquid (e.g., pressure-tube reactor, also the construction of the pressure-tubes) [G21C-1/20]
DIG 30[Patents] . . . Using fluid or fluent fuel [G21C-1/22] *** (With granular fuel DIG. 18)
DIG 31[Patents] . . Homogeneous reactors (i.e., in which the fuel and moderator present an effectively homogeneous medium to the neutrons) [G21C-1/24]
DIG 32[Patents] . . . Single-region reactors [G21C-1/26]
DIG 33[Patents] . . . Two-region reactors [G21C-1/28]
DIG 34[Patents] . Subcritical reactors; Experimental reactors with exception of swimming-pool reactors, zero-energy reactors [G21C-1/30]
DIG 35[Patents] . . Experimental and irradiation arrangements inside the reactor [G21C-1/30B] *** (irradiation loops DIG. 36; material testing by neutrons G01N-23/00B)
DIG 36[Patents] . . Irradiation loops [G21C-1/30D]
DIG 38[Patents] . Fuel elements [G21C-3/02] *** (manufacturing DIG. 283)
DIG 39[Patents] . . Constructional details [G21C-3/04]
DIG 40[Patents] . . . Means for removal of gases from fuel elements [G21C-3/04B]
DIG 41[Patents] . . . Fuel elements comprising casings with a mass of granular fuel with coolant passages through them [G21C-3/04C]
DIG 42[Patents] . . . Fuel elements with porous or capillary structure [G21C-3/04D]
DIG 43[Patents] . . . Casings; Jackets; Jacket materials [G21C-3/06]
DIG 44[Patents] . . . . Jacket materials (e.g., alloys) [G21C-3/06B]
DIG 45[Patents] . . . . Provided with external means to promote heat-transfer (e.g., fins, baffles) [G21C-3/08]
DIG 46[Patents] . . . . End closures; means for tight mounting therefor [G21C-3/10]
DIG 47[Patents] . . . . . Flattened end-closures [G21C-3/10B]
DIG 48[Patents] . . . . Means forming part of the element for locating it within the reactor core [G21C-3/12] *** (means not forming part of the element DIG. 102)
DIG 49[Patents] . . . . Means forming part of the element for inserting it into, or removing it from, the core; Means for coupling adjacent elements (e.g., to form a stringer) [G21C-3/14]
DIG 50[Patents] . . . Details of the construction within the casing [G21C-3/16]
DIG 51[Patents] . . . . Means for storage or immobilization of gases in fuel elements [G21C-3/16B]
DIG 52[Patents] . . . . Internal spacers; Other nonactive material within the casings (e.g., compensating for expansion of fuel rod; compensating for excess reactivity) [G21C-3/18] *** (interlayers DIG. 53)
DIG 53[Patents] . . . . With coating on fuel or on inside of casing; with nonactive interlayer between casing and active material; with multiple casings or multiple active layers [G21C-3/20]
DIG 54[Patents] . . Elements with fissile or breeder material in contact with coolant [G21C-3/22]
DIG 55[Patents] . . Elements with fissile or breeder material in fluid form within a nonactive casing [G21C-3/24]
DIG 56[Patents] . . Elements with fissile or breeder material in powder form within a nonactive casing [G21C-3/26] *** (DIG. 57 takes precedence)
DIG 57[Patents] . . Elements with fissile or breeder material in solid form within a nonactive casing [G21C-3/28]
DIG 58[Patents] . Assemblies of number of fuel elements in the form of a rigid unit [G21C-3/30]
DIG 59[Patents] . . Bundles of parallel pin-, rod-, or tube-shaped fuel elements [G21C-3/32]
DIG 60[Patents] . . . Means to influence the coolant flow through or around the assembly [G21C-3/32B] *** (DIG. 246 takes precedence)
DIG 61[Patents] . . . Coats and envelope surrounding the assembly [G21C-3/32C]
DIG 62[Patents] . . . Made of moderator-material [G21C-3/32D]
DIG 63[Patents] . . . Comprising fuel-elements of various compositions; comprising other pin-, rod-, or tube-like forms [G21C-3/32G] *** (elements influencing the coolant flow DIG. 60)
DIG 64[Patents] . . . . Special arrangements of elements in the assembly-lattice (e.g., fissile rods, fertile rods, water rods, poison rods, dummy-rods) [G21C-3/32G2]
DIG 65[Patents] . . . Supporting or hanging the elements in the assembly [G21C-3/32H] *** (Spacer grids DIG. 71); Means forming part of the assembly for inserting it into, or removing it from, the core; Means for coupling adjacent assemblies (means forming part of the element for inserting it into, or removing it from, the core; or means for coupling adjacent elements DIG. 49)
DIG 66[Patents] . . . . Supports for spacer grids [G21C-3/32H2]
DIG 67[Patents] . . . Means for the storage or removal of fission gases [G21C-3/32K] *** (means for the storage of fission gases in the elements DIG. 50; means for the removal of fission gases from elements DIG. 39+)
DIG 68[Patents] . . . Assembling the bundle; Exchange of elements in the bundle [G21C-3/32L]
DIG 69[Patents] . . . Spacer elements [G21C-3/32M] *** (spacer grids DIG. 71)
DIG 70[Patents] . . . . Helicoidal spacer elements [G21C-3/32M2]
DIG 71[Patents] . . . Spacer grids; other spacer devices [G21C-3/34]
DIG 72[Patents] . . . . Compact spacer grids (e.g., made of a plate or a blade) [G21C-3/34A]
DIG 73[Patents] . . . . Spacer grids formed of assembled tubular elements [G21C-3/34B]
DIG 74[Patents] . . . . Spacer grids wherein each cell has a circular cross section; cells formed of assembled metallic nonintersecting strips [G21C-3/34C]
DIG 75[Patents] . . . . Spacer grids wherein each cell has a polygonal (e.g., square cross section) ; cells formed of assembled metallic nonintersecting strips [G21C-3/34D]
DIG 76[Patents] . . . . . Polygonal cells formed of intersecting strips [G21C-3/34D2]
DIG 77[Patents] . . . . . . The cells being provided with fuel element supporting members [G21C-3/34D2A]
DIG 78[Patents] . . . . . . . Supporting members formed only by deformations in the intersecting strips [G21C-3/34D2A2]
DIG 79[Patents] . . . . . . . Supporting members formed only of elements fixed on the strips (e.g., by welding) [G21C-3/34D2A4]
DIG 80[Patents] . . . . Spacer grids formed by metallic wires (e.g., springs) [G21C-3/34E]
DIG 81[Patents] . . . . Fabrication of spacer grids [G21C-3/34F]
DIG 82[Patents] . . Assemblies of plate-shaped fuel elements or coaxial tubes [G21C-3/36]
DIG 83[Patents] . Fuel units consisting of a single fuel element in a supporting sleeve or in another supporting element [G21C-3/38]
DIG 84[Patents] . Structural combination of fuel element with thermoelectric element for direct production of electric energy from fission heat; or with another arrangement for direct production of electric energy (e.g., a thermionic device) [G21C-3/40] *** (temperature measurement DIG. 236; combination with thermoelements for temperature measurements DIG. 241)
DIG 85[Patents] . Selection of substances for use as reactor fuel [G21C-3/42]
DIG 86[Patents] . . Fluid or fluent reactor fuel [G21C-3/44]
DIG 87[Patents] . . . Aqueous compositions [G21C-3/46]
DIG 88[Patents] . . . . True or colloidal solutions of the active constituent [G21C-3/48]
DIG 89[Patents] . . . . Suspensions of the active constituent; Slurries [G21C-3/50]
DIG 90[Patents] . . . Liquid metal compositions [G21C-3/52]
DIG 91[Patents] . . . Fused salt, oxide or hydroxide compositions [G21C-3/54]
DIG 92[Patents] . . . Gaseous compositions; Suspensions in a gaseous carrier [G21C-3/56]
DIG 93[Patents] . . Solid reactor fuel; Pellets made of fissile material [G21C-3/58]
DIG 94[Patents] . . . Metallic fuel; Intermetallic dispersions [G21C-3/60]
DIG 95[Patents] . . . Ceramic fuel [G21C-3/62]
DIG 96[Patents] . . . . Oxide fuels [G21C-3/62B]
DIG 97[Patents] . . . . Coated fuel particles [G21C-3/62J]
DIG 98[Patents] . . . . Ceramic dispersion fuel (e.g., cermet) [G21C-3/64]
DIG 100[Patents] . Details [G21C-5/02]
DIG 101[Patents] . . Spatial arrangements allowing for Wigner growth [G21C-5/04]
DIG 102[Patents] . . Means for locating or supporting fuel elements [G21C-5/06] *** (means forming part of the element DIG. 48)
DIG 103[Patents] . . Means for preventing undesired asymmetric expansion of the complete structure (e.g., stretching devices, pins) [G21C-5/08]
DIG 104[Patents] . . Means for supporting the complete structure [G21C-5/10] *** (arrangements for supporting vessels and core structure DIG. 168)
DIG 105[Patents] . Characterized by composition (e.g., the moderator containing additional substances which ensure improved heat resistance of the moderator [G21C-5/12] *** (purification of fluid moderators during the operation of the reactor DIG. 266)
DIG 106[Patents] . . Moderators made of organic materials [G21C-5/12B]
DIG 107[Patents] . . Carbonic moderators [G21C-5/12G]
DIG 108[Patents] . Characterized by shape [G21C-5/14]
DIG 109[Patents] . . Shape of its constituent parts [G21C-5/16]
DIG 110[Patents] . Characterized by the provision of more than one active zone [G21C-5/18]
DIG 111[Patents] . . Wherein one zone contains fissile material and another zone contains breeder material [G21C-5/20]
DIG 112[Patents] . . Wherein one zone is a superheating zone [G21C-5/22]
DIG 114[Patents] . Flux flattening [G21C-7/00B]
DIG 115[Patents] . By using self-regulating properties of reactor materials (e.g., Doppler effect) [G21C-7/02] *** (arrangements that involve temperature stability DIG. 136)
DIG 116[Patents] . . Of burnable poisons [G21C-7/04]
DIG 117[Patents] . By application of neutron-absorbing material (i.e., material with absorption cross section very much in excess of reflection cross section) [G21C-7/06]
DIG 118[Patents] . . By displacement of solid control elements (e.g., control rods) [G21C-7/08]
DIG 119[Patents] . . . Construction of control elements [G21C-7/10]
DIG 120[Patents] . . . . Control assemblies containing one or more absorbant as well as other elements (e.g., fuel or moderator elements) [G21C-7/10B]
DIG 121[Patents] . . . . Control elements adapted for pebble bed reactors [G21C-7/10C]
DIG 122[Patents] . . . . Deformable control elements (e.g., flexible, telescopic or articulated) [G21C-7/10D]
DIG 123[Patents] . . . . Control elements made of flat elements; Control elements having cruciform cross section [G21C-7/10E]
DIG 124[Patents] . . . . Cluster or spider control rods [G21C-7/10F]
DIG 125[Patents] . . . Means for moving control elements to desired position [G21C-7/12]
DIG 126[Patents] . . . . Mechanical drive arrangements [G21C-7/14]
DIG 127[Patents] . . . . Hydraulic or pneumatic drive [G21C-7/16]
DIG 128[Patents] . . . Means for obtaining differential movement of control elements [G21C-7/18]
DIG 129[Patents] . . . Disposition of shock-absorbing devices; Braking arrangements [G21C-7/20] *** (shock absorbers in general F16F)
DIG 130[Patents] . . By displacement of a fluid or fluent neutron-absorbing material (e.g., by adding neutron absorbing material to the coolant) [G21C-7/22]
DIG 131[Patents] . . Selection of substances for use as neutron-absorbing material [G21C-7/24]
DIG 132[Patents] . By displacement of the moderator or parts thereof; by changing the moderator concentration [G21C-7/26]
DIG 133[Patents] . . Spectral shift control [G21C-7/26B]
DIG 134[Patents] . By displacement of the reflector or parts thereof [G21C-7/28]
DIG 135[Patents] . By displacement of the reactor fuel or fuel elements [G21C-7/30]
DIG 136[Patents] . By varying flow of coolant through the core; by adjusting the coolant or moderator temperature [G21C-7/32]
DIG 137[Patents] . By utilization of a primary neutron source [G21C-7/34]
DIG 138[Patents] . Control circuits [G21C-7/36]
DIG 139[Patents]EMERGENCY PROTECTION ARRANGEMENTS STRUCTALLY ASSOCIATED WITH THE REACTOR (e.g., safety valves provided with pressure equalization devices) [G21C-9/00] *** (emergency cooling arrangements DIG. 196)
DIG 140[Patents] . Pressure suppression [G21C-9/00B]
DIG 141[Patents] . . By rupture discs or diaphragms [G21C-9/00B2]
DIG 142[Patents] . . By stream condensation or by thermal accumulation [G21C-9/00B4]
DIG 143[Patents] . Core catchers [G21C-9/00D]
DIG 144[Patents] . Against explosions (e.g., blast shields) [G21C-9/00F]
DIG 145[Patents] . Against Na- or Ka- reactions [G21C-9/00I]
DIG 146[Patents] . Means for effecting very rapid reduction of the reactivity factor under fault conditions (e.g., reactor fuse, control elements having arrangements activated in an emergency) [G21C-9/02] *** (control elements, per se, DIG. 113+)
DIG 147[Patents] . . By fast movement of a solid (e.g, pebbles) [G21C-9/02B]
DIG 148[Patents] . . By an absorbant fluid [G21C-9/02D]
DIG 149[Patents] . . Reactor fuses [G21C-9/02F]
DIG 150[Patents] . . Rupture diaphragms [G21C-9/02H]
DIG 151[Patents] . Means for suppressing fires; Earthquake protection [G21C-9/04]
DIG 153[Patents] . Biological sheilding; Neutron and gamma shielding [G21C-11/02] *** (in general DIG. 319+)
DIG 154[Patents] . . Inside the reactor vessel [G21C-11/02B]
DIG 155[Patents] . . . Structurally combined with the casing [G21C-11/02B2]
DIG 156[Patents] . . In apertures or channels through a wall [G21C-11/02D]
DIG 157[Patents] . . Characterized by the form or by the material [G21C-11/02F]
DIG 158[Patents] . . On waterborne craft [G21C-11/04]
DIG 159[Patents] . Reflecting shields (i.e., for minimizing loss of neutrons) [G21C-11/06]
DIG 160[Patents] . Thermal shields; Thermal linings (i.e., for dissipating heat from gamma radiation which would otherwise heat an outer biological shield); Thermal insulation [G21C-11/08]
DIG 161[Patents] . . Consisting of a nonmetallic layer of insulating material [G21C-11/08B]
DIG 162[Patents] . . Consisting of one or more metallic layers [G21C-11/08D]
DIG 163[Patents] . . . Consisting exclusively of several metallic layers [G21C-11/08D2]
DIG 164[Patents] . . Consisting of a combination of nonmetallic and metallic layers (e.g., metal-sand-metal-concrete) [G21C-11/08E]
DIG 165[Patents] . . Consisting of a stagnant or a circulating fluid [G21C-11/08F]
DIG 166[Patents]PRESSURE VESSELS; CONTAINMENT VESSELS [G21C-13/00] *** (chemical or physical processes B01J-3/00; pressure vessels in general F16J-12/00)
DIG 167[Patents] . Details (e.g., seals, supporting constructions, ventillating arrangements, tube joints with a vessel wall) [G21C-13/02]
DIG 168[Patents] . . Supporting constructions for pressure vessels or containers [G21C-13/02B]
DIG 169[Patents] . . Seals (e.g., for pressure vessels or containers [G21C-13/02D]
DIG 170[Patents] . . . For container apertures [G21C-13/02D2]
DIG 171[Patents] . . Tube joints with a vessel wall (e.g., taking into account thermal stresses) [G21C-13/02F]
DIG 172[Patents] . . Ventillating arrangements [G21C-13/02G]
DIG 173[Patents] . . Tube crossings through a vessel wall [G21C-13/02H]
DIG 174[Patents] . . Arrangements for expansion and contraction [G21C-13/04]
DIG 175[Patents] . . Sealing plugs [G21C-13/06]
DIG 176[Patents] . . . For tubes (e.g., standpipes; Locking-devices for the plugs included) [G21C-13/06B]
DIG 177[Patents] . . . . Seals for the plugs [G21C-13/06B2]
DIG 178[Patents] . . . Closures for reactor-vessels (also rotatable) [G21C-13/06D]
DIG 179[Patents] . . . . Seals for closures or for rotatable closures [G21C-13/06D2]
DIG 180[Patents] . Vessels characterized by the material; Selection of materials for pressure vessels [G21C-13/08]
DIG 181[Patents] . . Metallic vessels [G21C-13/08B]
DIG 182[Patents] . . . Tube-type vessels (e.g., for not essentially pressurized coolants) [G21C-13/08B2]
DIG 183[Patents] . . Concrete vessels [G21C-13/08D]
DIG 184[Patents] . . . Made of prestressed-concrete [G21C-13/08D2]
DIG 185[Patents] . . . . Particulars concerning pre-stressing devices (and cables) [G21C-13/08D2B]
DIG 186[Patents] . Means for preventing contamination in the event of leakage (e.g., double wall) [G21C-13/10]
DIG 188[Patents] . Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices [G21C-15/02] *** (DIG. 246 takes precedence); (coolant flow control through fuel assemblies (e.g., flow restrictors) DIG. 60)
DIG 189[Patents] . . From fissile or breeder material [G21C-15/04] *** (DIG. 59 takes precedence)
DIG 190[Patents] . . . In fuel elements [G21C-15/06]
DIG 191[Patents] . . From moderating material [G21C-15/08]
DIG 192[Patents] . . From reflector or thermal shield [G21C-15/10]
DIG 193[Patents] . . From pressure vessel; from containment vessel [G21C-15/12]
DIG 194[Patents] . . From headers; from joints in ducts [G21C-15/14]
DIG 195[Patents] . Comprising means for separating liquid and steam [G21C-15/16]
DIG 196[Patents] . Emergency cooling arrangements; Removing shut-down heat [G21C-15/18]
DIG 197[Patents] . Partitions or thermal insulation between fuel channel and moderator [G21C-15/20]
DIG 198[Patents] . Structural association of coolant tubes with headers [G21C-15/22]
DIG 199[Patents] . Promoting flow of the coolant [G21C-15/24]
DIG 200[Patents] . . For liquids [G21C-15/24B]
DIG 201[Patents] . . . For liquid metals [G21C-15/24B2]
DIG 202[Patents] . . . Jet-pumps [G21C-15/24B4]
DIG 203[Patents] . . For gases (ventilators) [G21C-15/24D]
DIG 204[Patents] . . Heat-pipes [G21C-15/24F]
DIG 205[Patents] . . By convection (e.g., using chimneys, using divergent channels [G21C-15/26]
DIG 206[Patents] . Selection of specific coolants; additions to the reactor coolants (e.g., against moderator corrosion) [G21C-15/28] *** (if serving as the moderator DIG.105, Compositions, per se, C09K-5/00; Organic coolants DIG. 106; purification and regeneration of the reactor coolants DIG. 266)
DIG 208[Patents] . Mechanical simulators [G21C-17/00B] *** (electrical or magnetic simulators G06G-7/54)
DIG 209[Patents] . Detection of leaks [G21C-17/00C] *** (by testing the coolant or the moderator DIG. 224)
DIG 210[Patents] . Remote inspection of vessels (e.g., pressure vessels) [G21C-17/00D]
DIG 211[Patents] . . Inspection of outer surfaces of vessels [G21C-17/00D1]
DIG 212[Patents] . . Inspection of inner surfaces of vessels [G21C-17/00D2]
DIG 213[Patents] . . Inspection vehicles [G21C-17/00D3]
DIG 214[Patents] . Inspection or maintenance of pipe-lines or tubes in nuclear installations [G21C-17/00F]
DIG 215[Patents] . Devices or arrangements for monitoring coolant or moderator [G21C-17/02]
DIG 216[Patents] . . For monitoring liquid coolants or moderators [G21C-17/02B]
DIG 217[Patents] . . . For monitoring liquid metal coolants [G21C-17/02B2] *** (molten metal sampling in general G01N-1/12B)
DIG 218[Patents] . . . . Liquid metal leaks detection [G21C-17/02B2B] *** (detecting leaks in pipe-line systems in general F17D-5/00)
DIG 219[Patents] . . For monitoring gaseous coolants [G21C-17/02D]
DIG 220[Patents] . . Solid moderators testing (e.g., graphite) [G21C-17/02F]
DIG 221[Patents] . . Reactor coolants flow measuring or monitoring [G21C-17/02H] *** (measuring volume or mass flow in general G01F)
DIG 222[Patents] . . Moderator or coolant level detection devices [G21C-17/02K] *** (indicating or measuring liquid level in general G01F-23/00)
DIG 223[Patents] . . Moderator or coolant boiling detection [G21C-17/02M]
DIG 224[Patents] . . Detecting burst slugs [G21C-17/04]
DIG 225[Patents] . . . Characterized by (matrix) systems for checking the coolant channels [G21C-17/04B]
DIG 226[Patents] . . . Devices for selective sampling (e.g., valves, shutters, rotatable selector valves) [G21C-17/04D]
DIG 227[Patents] . . . Detectors and metering devices for the detection of fission products [G21C-17/04F]
DIG 228[Patents] . . . . Precipitation chambers [G21C-17/04F2]
DIG 229[Patents] . . . . Detection and metering circuits [G21C-17/04F4]
DIG 230[Patents] . . . Characterized by a special construction of fuel elements (e.g., by a confined "tracer") [G21C-17/04H]
DIG 231[Patents] . Devices or arrangements for monitoring or testing fuel or fuel elements (e.g., for burn-up, for contamination, for leak-tightness) not during reactor operation [G21C-17/06] *** (DIG. 235, DIG. 236 take precedence) (detection of leaking fuel elements during reactor operation DIG. 224)
DIG 232[Patents] . . Leak-tightness control [G21C-17/06B] *** (DIG. 234 takes precedence)
DIG 233[Patents] . . Burn-up control [G21C-17/06D] *** (DIG. 234 takes precedence)
DIG 234[Patents] . . Control of spherical elements [G21C-17/06F]
DIG 235[Patents] . Structural combination of reactor core or moderator structure with viewing means (e.g., with television camera, periscope, window) [G21C-17/08]
DIG 236[Patents] . Structural combination of fuel element, control rod, reactor core, or moderator structure with sensitive instruments (e.g., for measuring temperature) [G21C-17/10]
DIG 237[Patents] . . Measuring reactivity [G21C-17/10B]
DIG 238[Patents] . . Measuring the reactor flux within the reactor (e.g., within its pressure vessel) [G21C-17/10D]
DIG 239[Patents] . . Measuring the temperature [G21C-17/10E]
DIG 240[Patents] . . Passages and insulators for electric cables and for measuring purposes [G21C-17/10G]
DIG 241[Patents] . . The sensitive element being part of a fuel element or a fuel assembly [G21C-17/10S] *** (structural combination with a thermoelectric element for direct production of electrical energy DIG. 84)
DIG 242[Patents] . . Sensitive element forming part of control element [G21C-17/12]
DIG 243[Patents] . Period meters [G21C-17/14]
DIG 245[Patents] . Details of handling arrangements [G21C-19/02]
DIG 246[Patents] . . Means for controlling flow of coolant over objects being handled; Means for controlling flow of coolant through channel being serviced (e.g., for preventing "blow-out") [G21C-19/04]
DIG 247[Patents] . . Magazines for holding fuel element or control elements [G21C-19/06]
DIG 248[Patents] . . . Storage racks; Storage pools [G21C-19/06B]
DIG 249[Patents] . . . Rotatable magazines [G21C-19/06D]
DIG 250[Patents] . . Means for heating fuel elements before introduction into the core; Means for heating or cooling fuel elements after removal from the core [G21C-19/08]
DIG 251[Patents] . . Lifting devices or pulling devices adapted for cooperation with fuel elements or with control elements [G21C-19/10]
DIG 252[Patents] . . . With grasping or spreading coupling elements [G21C-19/10B]
DIG 253[Patents] . . . With revolving coupling elements (e.g., socket coupling) [G21C-19/10D]
DIG 254[Patents] . . . With latching devices and ball couplings [G21C-19/10F]
DIG 255[Patents] . . Arrangements for exerting direct hydraulic or pneumatic force on fuel element or on control element [G21C-19/12]
DIG 256[Patents] . Characterized by their adaptation for use with horizontal channels in the reactor core [G21C-19/14]
DIG 257[Patents] . Articulated or telescopic chutes or tubes for the connection to channels in the reactor core [G21C-19/16]
DIG 258[Patents] . Apparatus for bringing fuel elements to the reactor charge area (e.g., from a storage place) [G21C-19/18]
DIG 259[Patents] . Arrangements for introducing object into the pressure vessel; Arrangements for handling objects within the pressure vessel; Arrangements for removing objects from the pressure vessel [G21C-19/20]
DIG 260[Patents] . . Arrangements for handling ball-form (i.e., pebble fuel) [G21C-19/20A]
DIG 261[Patents] . . Interchanging of fuel elements in the core (fuel shuffling) [G21C-19/20B]
DIG 262[Patents] . . Arrangements for obtaining access to the interior of a pressure vessel while the reactor is operating [G21C-19/22]
DIG 263[Patents] . . . By using an auxiliary vessel which is temporarily sealed to the pressure vessel [G21C-19/24]
DIG 264[Patents] . Arrangements for removing jammed or damaged fuel elements or control elements; Arrangements for moving broken parts thereof [G21C-19/26]
DIG 265[Patents] . Arrangements for introducing fluent material into the reactor core; Arrangements for removing fluent material from the reactor core [G21C-19/28] *** (pumping coolant DIG. 199+ and 294)
DIG 266[Patents] . . With continuous purification of circulating fluent material (e.g., by extraction of fission products, deterioration or corrosion products, impurities (e.g., by cold traps) [G21C-19/30] *** (purification of circulating fluid fuels DIG. 281; separation in general B01D)
DIG 267[Patents] . . . Specially adapted for gases [G21C-19/30B] *** (decontamination of gases DIG. 378)
DIG 268[Patents] . . . Specially adapted for liquids [G21C-19/30D] *** (decontamination of liquids DIG. 379)
DIG 269[Patents] . . . . For molten metals [G21C-19/30D2]
DIG 270[Patents] . . . . . Using "cold traps" [G21C-19/30D2B]
DIG 271[Patents] . . . Recombination devices [G21C-19/30R]
DIG 272[Patents] . Apparatus for removing radioactive objects or materials from the reactor discharge area (e.g., to a storage place); Apparatus for handling radioactive objects or materials within a storage place or removing them therefrom [G21C-19/32] *** (disposal of waste material DIG. 375+)
DIG 273[Patents] . Apparatus or processes for removing canning or casings from fuel; Separation of fuel and jacket material; also fuel elements, perforation (e.g., for sampling); Separation of fuel elements and fuel element-jackets in pieces; removal of end closures [G21C-19/34] *** (shielded cells DIG. 355+)
DIG 274[Patents] . . Mechanical means only [G21C-19/36]
DIG 275[Patents] . . Chemical means only [G21C-19/38]
DIG 276[Patents] . Arrangements for preventing occurence of critical conditions (e.g., during storage) [G21C-19/40]
DIG 277[Patents] . Reprocessing of irradiated fuel [G21C-19/42]
DIG 278[Patents] . . Of irradiated solid fuel [G21C-19/44]
DIG 279[Patents] . . . Aqueous processes (e.g., by using organic extraction means, including the regeneration of these means) [G21C-19/46]
DIG 280[Patents] . . . Nonaqueous processes [G21C-19/48]
DIG 281[Patents] . . Of irradiated fuel; also the regeneration of the fuels while the reactor is in operation [G21C-19/50]
DIG 283[Patents] . Manufacture of fuel elements or breeder elements contained in nonactive casings [G21C-21/02]
DIG 284[Patents] . . By vibrational compaction or tamping of fuel in the jacket [G21C-21/04]
DIG 285[Patents] . . By rotatable swaging of the jacket around the fuel [G21C-21/06]
DIG 286[Patents] . . By a slip-fit cladding process; by crimping the jacket around the fuel [G21C-21/08]
DIG 287[Patents] . . By extrusion, drawing, or stretching; by rolling (e.g., "picture frame" technique) [G21C-21/10]
DIG 288[Patents] . . By hydrostatic or thermo-pneumatic cannings (in general by pressing without lenthening, e.g., explosive coating) [G21C-21/12]
DIG 289[Patents] . . By plating the fuel in a fluid [G21C-21/14]
DIG 290[Patents] . . By casting or dipping techniques [G21C-21/16]
DIG 291[Patents] . . Manufacture of control elements covered by DIG. 113+ [G21C-21/18]
DIG 292[Patents]DETAILS OF NUCLEAR POWER PLANT [G21D-1/00] *** (control DIG. 296)
DIG 293[Patents] . Nuclear facilities decommissioning arrangements [G21D-1/00B] *** (decontamination arrangements; treating radioactively contaminated material DIG. 375+)
DIG 294[Patents] . Arrangements of auxiliary equipment [G21D-1/02]
DIG 295[Patents] . Pumping arrangements [G21D-1/04] *** (within the reactor pressure vessel DIG. 199+; electrodynamic pumps H02K-44/02)
DIG 296[Patents]CONTROL OF NUCLEAR POWER PLANT [G21D-3/00] *** (control of nuclear reaction in general DIG. 113)
DIG 297[Patents] . Manual control [G21D-3/02]
DIG 298[Patents] . Safety arrangements [G21D-3/04] *** (emergency protection of reactor DIG. 139+)
DIG 299[Patents] . . Responsive to faults within the plant [G21D-3/06] *** (in the reactor DIG. 139+)
DIG 300[Patents] . Regulation of any parameters in the plant [G21D-3/08]
DIG 301[Patents] . . By a combination of a variable derived from neutron flux with other controlling variables (e.g., derived from temperature, cooling flow, pressure) [G21D-3/10]
DIG 302[Patents] . . By adjustment of the reactor in response only to changes in engine demand [G21D-3/12]
DIG 303[Patents] . . . Varying flow of coolant [G21D-3/14]
DIG 304[Patents] . . . Varying reactivity [G21D-3/16]
DIG 305[Patents] . . By adjustment of plant external to the reactor only in response to change in reactivity [G21D-3/18]
DIG 307[Patents] . Reactor and engine structurally combined (e.g., portable) [G21D-5/02]
DIG 308[Patents] . Reactor and engine not structurally combined [G21D-5/04]
DIG 309[Patents] . . With engine working medium circulating through reactor core [G21D-5/06]
DIG 310[Patents] . . With engine working medium heated in a heat exhanger by the reactor coolant [G21D-5/08]
DIG 311[Patents] . . . Liquid working medium partially heated by reactor and vaporized by heat source external to the core (e.g., with oil heating) [G21D-5/10]
DIG 312[Patents] . . . Liquid working medium vaporized by reactor coolant [G21D-5/12]
DIG 313[Patents] . . . . And also superheated by reactor coolant [G21D-5/14]
DIG 314[Patents] . . . . Superheated by separate heat source [G21D-5/16]
DIG 315[Patents]ARRANGEMENTS FOR DIRECT PRODUCTION OF ELECTRIC ENERGY FROM FUSION OR FISSION REACTIONS [G21D-7/00] *** (obtaining electric energy from radioactive sources DIG. 410)
DIG 316[Patents] . Using magneto-hydrodynamic generators [G21D-7/02]
DIG 317[Patents] . Using thermoelectric elements and/or thermoionic converters [G21D-7/04] *** (structural combination of fuel element with thermoelectric element and/or thermoionic converter DIG. 84; structural combination of fuel element with thermoelectric element DIG. 415, DIG. 84)
DIG 320[Patents] . Selection of uniform shielding materials [G21F-1/02]
DIG 321[Patents] . . Liquids [G21F-1/02B]
DIG 322[Patents] . . Semi-liquids, gels, pastes [G21F-1/02C]
DIG 323[Patents] . . Concretes; Other hydraulic hardening materials [G21F-1/04]
DIG 324[Patents] . . . Combined with other materials dispersed in the carrier [G21F-1/04B]
DIG 325[Patents] . . . . With organic substances [G21F-1/04B2]
DIG 326[Patents] . . . . With metals [G21F-1/04B4]
DIG 327[Patents] . . Ceramics; Glasses; Refractories [G21F-1/06] *** (cermets DIG. 328)
DIG 328[Patents] . . Metals; Alloys; Cermets (i.e., sintered mixtures of ceramics and metals) [G21F-1/08]
DIG 329[Patents] . . . Heavy metals or alloys [G21F-1/08B]
DIG 330[Patents] . . Organic substances; Dispersions in organic carriers [G21F-1/10]
DIG 331[Patents] . . . Dispersions in organic carriers [G21F-1/10B]
DIG 332[Patents] . . . . Metallic dispersions [G21F-1/10B2]
DIG 333[Patents] . Laminated shielding materials [G21F-1/12]
DIG 334[Patents] . . Comprising metals [G21F-1/12B]
DIG 335[Patents]SHIELDING CHARACTERIZED BY ITS PHYSICAL FORM (e.g., granules or shape of the material) [G21F-3/00]
DIG 336[Patents] . Clothing [G21F-3/02]
DIG 337[Patents] . . Clothing surrounding the wearer completely [G21F-3-02B]
DIG 338[Patents] . . Aprons [G21F-3/02C]
DIG 339[Patents] . . Gloves [G21F-3/02D] *** (mounting means on glove boxes DIG. 363)
DIG 340[Patents] . Bricks; Shields made up therefrom [G21F-3/04]
DIG 342[Patents] . Containers for fluid wastes [G21F-5/00A]
DIG 343[Patents] . Containers for solid radioactive wastes (e.g., ultimate disposal containers) [G21F-5/00B] *** (DIG. 347 takes precedence)
DIG 344[Patents] . . Containers for fuel elements [G21F-5/00B2]
DIG 345[Patents] . . . Fuel element racks in the container [G21F-5/00B2B]
DIG 346[Patents] . Shock absorbers, specially adapted therefor (e.g., impact buffers for containers) [G21F5-00D]
DIG 347[Patents] . Containers provided with a rotatable drum [G21F-5/00F]
DIG 348[Patents] . Specially adapted heat removal systems (e.g., by a circulating fluid or by cooling fins.); Specially adapted protection against external fire [G21F-5/00H]
DIG 349[Patents] . Closures for containers or corresponding sealing arrangements [G21F-5/00J]
DIG 350[Patents] . For storing radioactive sources (e.g., source carriers for irradiation units); Radio isotope containers [G21F-5/00L]
DIG 351[Patents] . . Syringe shields and holders [G21F-5/00L2]
DIG 352[Patents] . Specially adapted containers or shipping cask handling devices (e.g., transporting devices) [G21F-5/00N]
DIG 353[Patents] . With provision for restricted exposure of a radiation source within the container [G21F-5/02]
DIG 354[Patents] . . Means for controlling exposure (e.g., time, size of aperture) [G21F-5/04]
DIG 356[Patents] . Shielded passages through walls; Locks; Transferring devices between rooms [G21F-7/00B] *** (between glove-boxes DIG. 362)
DIG 357[Patents] . . Transferring by fluidic means [G21F-7/00B2]
DIG 358[Patents] . Room atmosphere, temperature or pressure control devices [G21F-7/00C] *** (glove-boxes DIG. 364)
DIG 359[Patents] . Observation devices permitting vision but shielding the observer (e.g., window, periscope) [G21F-7/02]
DIG 360[Patents] . . Windows (e.g., shielded) [G21F-7/02B]
DIG 361[Patents] . Shielded glove-boxes [G21F-7/04]
DIG 362[Patents] . . Shielded passages through walls; Locks; Closing or transferring means between glove-boxes [G21F-7/04B] *** (in general DIG. 356)
DIG 363[Patents] . . Glove mounting means [G21F-7/04C]
DIG 364[Patents] . . Glove-box atmosphere, temperature or pressure control devices [G21F-7/04D] *** (in general DIG. 358)
DIG 365[Patents] . . Lighting [G21F-7/04F]
DIG 366[Patents] . . Transportable glove-boxes [G21F-7/04G]
DIG 367[Patents] . Structural combination with remotely controlled apparatus (e.g., with manipulators) [G21F-7/06]
DIG 368[Patents] . . Integrated manipulators [G21F-7/06B]
DIG 369[Patents] . . . Mounted in a wall (e.g., pivotably mounted) [G21F-7/06B2]
DIG 370[Patents] . . Remotely manipulated measuring or controlling devices [G21F-7/06C] *** (combined with window DIG. 359)
DIG 371[Patents] . . Remotely manipulated machinery [G21F-7/06D]
DIG 372[Patents] . . Remotely manipulated tools [G21F-7/06F]
DIG 373[Patents] . . Transferring devices within cells or boxes [G21F-7/06G] *** (between cells DIG. 356, 362)
DIG 374[Patents] . . Remotely manipulating devices for fluids [G21F-7/06H]
DIG 376[Patents] . Decontamination of contaminated objects, apparatus, clothes, food; Preventing contamination thereof [G21F-9/00B]
DIG 377[Patents] . Recovery of isotopes from radioactive waste (e.g., fission products [G21F-9/00C]
DIG 378[Patents] . Treating gases [G21F-9/02]
DIG 379[Patents] . Treating liquids [G21F-9/04]
DIG 380[Patents] . . Processing [G21F-9/06]
DIG 381[Patents] . . . By evaporation; by distillation [G21F-9/08]
DIG 382[Patents] . . . By flocculation [G21F-9/10]
DIG 383[Patents] . . . By absorption; by adsorption; by ion exchange [G21F-9/12]
DIG 384[Patents] . . . By incineration; by calcination (e.g., desiccation) [G21F-9/14]
DIG 385[Patents] . . . By fixation in stable solid media [G21F-9/16]
DIG 386[Patents] . . . By biological processes [G21F-9/18]
DIG 387[Patents] . . Disposal of liquid waste [G21F-9/20]
DIG 388[Patents] . . . By storage in a tank or other container [G21F-9/22]
DIG 389[Patents] . . . By storage in the ground; by storage underwater (e.g., in ocean) [G21F-9/24]
DIG 390[Patents] . . . By dilution in water (e.g., in ocean, in stream) [G21F-9/26]
DIG 391[Patents] . Treating solids [G21F-9/28]
DIG 392[Patents] . . Processing [G21F-9/30]
DIG 393[Patents] . . . By incineration [G21F-9/32]
DIG 394[Patents] . . Disposal of solid waste [G21F-9/34]
DIG 395[Patents] . . . By packaging; by baling [G21F-9/36]
DIG 397[Patents] . In nuclear reactors {G21G-1/02]
DIG 398[Patents] . Outside of nuclear reactors or particle accelerators [G21G-1/04]
DIG 399[Patents] . . By neutron irradiation [G21G-1/06]
DIG 400[Patents] . . . Accompanied by nuclear fission [G21G-1/08]
DIG 401[Patents] . . By bombardment with electrically charged particles [G21G-1/10] *** (irradiation devices DIG. 440+)
DIG 402[Patents] . . By electromagnetic irradiation (e.g., with gamma or X-rays) [G21G-1/12] *** (applications of radiation DIG. 421; irradiation devices DIG. 440+)
DIG 403[Patents]RADIOACTIVE SOURCES [G21G-4/00] *** (producing neutrons or other subatomic particles, X- or gamma rays, in fusion reactors DIG. 1+, in nuclear reactors DIG. 5+; in accelerators H05H; X-ray tubes H01J-35/00; gamma masers H01S-4/00)
DIG 404[Patents] . Neutron sources [G21G-4/02]
DIG 405[Patents] . Radioactive sources other than neutron sources [G21G-4/04]
DIG 406[Patents] . . Characterized by constructional features [G21G-4/06]
DIG 407[Patents] . . . Specially adapted for medical application [G21G-4/08]
DIG 408[Patents] . . With radium emanation [G21G-4/10]
DIG 410[Patents]ARRANGEMENTS FOR OBTRAINING ELECTRICAL ENERGY FROM RADIOACTIVE SOURCES (e.g., from radioactive isotopes, nuclear or atomic batteries) [G21H-1/00] *** (fusion reactors DIG. 1+; nuclear reactors DIG. 5+)
DIG 411[Patents] . Cells charged directly by beta radiation [G21H-1/02]
DIG 412[Patents] . Cells using secondary emission induced by alpha radiation, beta radiation, or gamma radiation [G21H-1/04] *** (discharge tubes H01J-40/00)
DIG 413[Patents] . Cells wherein radiation is applied to the junction of different semiconductor materials [G21H-1/06]
DIG 414[Patents] . Cells in which radiation ionizes a gas in the presence of a junction of two dissimilar metals (i.e., contact potential difference cells) [G21H-1/08] *** (discharge tubes H01J)
DIG 415[Patents] . Cells in which radiation of disintegration heats a thermoelectric junction or a thermionic converter [G21H-1/10] *** (devices where heating occurs from fission reactions DIG. 39; discharge tubes functioning as thermionic generators H01J-45/00; thermoelectric devices comprising a junction of dissimilar materials H01L-35/00)
DIG 416[Patents] . . Cells provided with thermoelectric generators [G21H-1/10B]
DIG 417[Patents] . . Cells provided with thermionic generators [G21H-1/10C]
DIG 418[Patents] . Cells using conversion of the radiation into light combined with subsequent photoelectric conversion into electric energy [G21H-1/12]
DIG 420[Patents] . In which material is excited to luminesce by the radiation [G21H-3/02]
DIG 422[Patents] . As tracers [G21H-5/02] *** (medicinal preparations containing radioactive substances A61K-43/00; investigating or analyzing biological material G01N-33/16)
DIG 424[Patents]PEACEFUL APPLICATIONS OF NUCLEAR EXPLOSIVE DEVICES [G21J-3/00] *** (obtaining oil, gas, water, soluble or meltable material from deep wells by means of nuclear energy E21B-43/236F, 43/24F)
DIG 425[Patents] . For excavation [G21J-3/02]
DIG 426[Patents]DETECTION ARRANGEMENTS FOR NUCLEAR EXPLOSIONS [G21J-5/00] *** (individual measuring devices G01N)
DIG 427[Patents]ARRANGEMENTS FOR HANDLING RADIATION OR PARTICLES (e.g., focusing, moderating [G21K-1/00] *** (radiation filters DIG. 435)
DIG 428[Patents] . Using diaphragms, collimators [G21K-1/02]
DIG 429[Patents] . . Using multiple collimators (e.g., Bucky screens); other devices for eliminating undesired or dispersed radiation [G21K-1/02B]
DIG 430[Patents] . . Using variable diaphragms, shutters, choppers [G21K-1/04]
DIG 431[Patents] . Using diffraction, refraction or reflection, e.g., monochromators [G21K-1/06] *** (DIG. 435, 445 take precedence)
DIG 432[Patents] . Deviation, concentration or focusing of the beam by electric or magnetic means [G21K-1/08] *** (electron-optical arrangements in electric discharge tubes H01J-29/46; details (e.g., electric or magnetic deviating means for direct voltage accelerators or in accelerators using single pulses) H05H-5/02; arrangements for injecting particles into orbits H05H-7/08; arrangements for ejecting particles from orbits H05H-7/10)
DIG 433[Patents] . . By electrical means [G21K-1/087]
DIG 434[Patents] . . By magnetic means [G21K-1/093]
DIG 435[Patents] . Scattering devices; Absorbing devices [G21K-1/10]
DIG 436[Patents] . . Resonant absorbers or driving arrangements therefor (e.g., for Moessbauer-effect devices) [G21K-1/12] *** (motors with reciprocating, oscillating or vibrating magnet, armature or coil system in general H02K-33/00)
DIG 437[Patents] . Using charge exchange devices (e.g., for neutralizing or changing the sign of the electrical charges of beams) [G21K-1/14] *** (producing or accelerating neutral particle beams H05H-3/00)
DIG 438[Patents] . Using polarizing devices (e.g., for obtaining a polarized beam) [G21K-1/16] *** (ion sources, ion guns H01J-27/02; polarized targets for producing nuclear reactions H05H-6/00B)
DIG 439[Patents]CONVERSION SCREENS FOR THE CONVERSION OF THE SPATIAL DISTRIBUTION OF X-RAYS OR PARTICLE RADIATION INTO VISIBLE IMAGES (e.g., fluoroscopic screens) [G21K-4/00] *** (photographic processes using X-ray intensifiers G03C-5/17; discharge tubes comprising luminescent screens H01J-1/62; cathode-ray tubes for X-ray conversion with optical output H01J-31/50)
DIG 440[Patents]IRRADIATION DEVICES [G21K-5/00] *** (discharge tubes for irradiating H01J-37/00)
DIG 441[Patents] . Having no beam-forming means [G21K-5/02]
DIG 442[Patents] . With beam-forming means [G21K-5/04]
DIG 443[Patents] . Holder for targets or for other objects to be irradiated [G21K-5/08]
DIG 444[Patents] . With provision for relative movement of beam source and object to be irradiated [G21K-5/10]

Information Products Division -- Contacts

Questions regarding this report should be directed to:

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Information Products Division
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tel: (703) 306-2600
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Last Modified: 6 October 2000