Glass compositions and compositions for making glass, i.e.,
glass batch compositions, devitrified glass-ceramic compositions
and processes for producing such compositions. These compositions
may be regarded as thermoplastic compositions.
Fired clay containing compositions in the nature of porcelain,
earthenware, and similar materials. These compositions may be regarded
as thermosetting compositions.
See the Glossary for the definition of the term "ceramic".
SECTION II - LINES WITH OTHER CLASSES AND WITHIN THIS CLASS
Optional ingredients. Disclosures reciting an optional ingredient,
such as a statement that a composition includes a range of concentration
of the ingredient, including zero percent as the lower end of the
range (i.e., containing or comprising 0 - X percent by weight of
that ingredient) are classified in a more generic subclass and cross-referenced
to an indented subclass which provides for the presence of that
ingredient. As an example, a refractory composition which comprises
0 - 10 percent of silicon carbide might be classified as an original
in subclass 87 and cross-referenced in subclass 88.
Mol percent and weight percent. When in a disclosure otherwise
classifiable in subclasses 54, 55, 73, 121, or 131 recites the concentration
of the material specified in the subclass title is in mol percent
rather than weight percent, it may be necessary to calculate the
equivalent weight percent to classify the disclosure properly.
1. A COMPOUND, PER SE, IS CLASSIFIED IN A COMPOUND CLASS REGARDLESS
OF UTILITY.
See References to Other Classes, below, for compound classes.
2. COMPOSITION OR MATERIAL.
A. The rules for determining Class placement of the Original
Reference (OR) for claimed chemical compositions are set forth in
the Class Definition of Class 252 in the SECTION LINES WITH OTHER
CLASSES AND WITHIN THIS CLASS, subsection COMPOSITION CLASS SUPERIORITY,
which includes a hierarchical ORDER OF SUPERIORITY FOR COMPOSITION CLASSES.
It is the general rule of classification to classify a process
of preparing a composition along with the composition. In those
circumstances where only a process of preparing a composition is
claimed and there is no claim to a composition, the claim would
be classified identically as if it were a composition claim.
B. Lines With Article Or Product Classes.
1. As a general rule, a product (article) is classified with the
class specifically providing for the same or a generic class which
can take the same.
2. This class (501) provides for an article or product defined
in terms of its compositions.
3. An article or product defined by B, 2 above, combined with
significant structure for another class will be classified in the
class providing for the structure and crossed to Class 501.
4. Subject matter involving multiple claimed inventions--i.e.,
claims for both Class 501 and those classes in References to Other
Classes below that are related to "Composition or Material," section
A or section B--will be classified in said class and crossed to
Class 501.
See References to Other Classes for article or product classes.
C. PROCESS AND APPARATUS CLASSES
See References to Other Classes, below for process and apparatus
classes.
D. SPECIAL CLASSES
See References to Other Classes, below for special classes.
Cutlery,
subclass 345 for structured cutlery articles defined in part
in terms of the materials of its makeup. (see Lines With Other
Classes, "Composition or Material," section B,
above)
Static Structures (e.g., Buildings), appropriate subclasses for structures of that class
made of ceramic material. (see Lines With Other Classes, "Composition
or Material," section B, above)
Gas Separation, appropriate subclasses for apparatus having ceramic filtering
material, especially
subclasses 522+ ; particularly subclass 523 for specific media material,
ceramic or sintered. (see Lines With Other Classes, "Composition
or Material," section B, above)
Glass Manufacturing, appropriate subclasses for glass working or treating.
See the class definition of Class 65 for the line between Classes 65
and 501, especially the Glossary therein for the definitions of
glass working and glass treating,
subclasses 2+ for such process of making fibers or filaments;
subclasses 19+ for processes employing slag; subclasses
21+ for bead making; subclass 22 for preforming; subclass 33
for devitrifying or vitrifying crystalline glass; subclasses 36+ for
fusion bonding of glass to a preformed part, subclasses 60.1+ for a
process involving glass working or treating, as well as coating;
and subclasses 134+ for processes of purifying or homogenizing
molten glass. (Process class)
Chemistry: Fertilizers, appropriate subclasses for fertilizers containing
ceramic material. (see Lines With Other Classes, "Composition or
Material," section B, above)
Specialized Metallurgical Processes, Compositions
for Use Therein, Consolidated Metal Powder Compositions, and Loose
Metal Particulate Mixtures,
subclasses 228+ for consolidated metal powders which may contain
a ceramic material in which the metal particles form a continuous
phase, but the ceramic particles do not form a continuous phase.
(Special Class)
Specialized Metallurgical Processes, Compositions
for Use Therein, Consolidated Metal Powder Compositions, and Loose
Metal Particulate Mixtures,
subclasses 201+ for pyrometallurgy process involving sintering
a metal and nonmetal. (Process class)
Compositions: Coating or Plastic, appropriate subclasses for nonceramic coating or plastic compositions,
especially
subclasses 74+ for alkali metal silicate containing compositions; subclasses
85+ for inorganic settable compositions; particularly subclasses
100+ for Portland cement making; subclasses 109+ for
making cementitious materials from gypsum; subclass 312 for opacifiers
intended for inclusion in enamel compositions; and subclass 313
for fluxes intended to be used in ceramic compositions. (Process/apparatus
class)
Single-Crystal, Oriented-Crystal, and Epitaxy Growth
Processes; Non-Coating Apparatus Therefor, for processes and non-coating apparatus for growing
therein-defined single-crystal of all types of materials, including
ceramic. (Process/apparatus class)
Stoves and Furnaces, appropriate subclasses for stoves and furnaces which may
contain a ceramic element, especially
subclass 400 for fireless cookers which are heat accumulators; subclasses
204+ for body warmers; and subclass 273.5 for ovens. (apparatus
class)
Electricity: Circuit Makers and Breakers,
subclasses 262+ for electrical contacts composed of named material.
(see Lines With Other Classes, "Composition or Material," section
B, above)
Chemistry: Electrical and Wave Energy,
subclasses 280+ for electrolytic electrodes. (see Lines With
Other Classes, "Composition or Material," section
B, above)
Chemistry: Electrical and Wave Energy, appropriate subclasses, especially
subclasses 157.15+ for processes of preparing a specific compound
utilizing a wave energy process. (Compound class)
Liquid Purification or Separation, appropriate subclasses for process and apparatus
using ceramic material in a liquid separation operation. (Process/apparatus
class)
Solid Material Comminution or Disintegration, appropriate subclasses for process or apparatus for
comminuting materials. See section 2 of the Class 241 definition
for the class line. (Process/apparatus class)
Static Molds,
subclass 134 for molds having named material classifiable, per
se, in this class (501). (see Lines With Other Classes, "Composition
or Material," section B, above)
Compositions,
subclass 62 for sound or heat insulators defined by their composition
which is other than ceramic. (see Lines With Other Classes, "Composition
or Material," section B, above)
Active Solid-State Devices (e.g., Transistors, Solid-State
Diodes), appropriate subclasses for those devices which contain
ceramic material, including
subclass 700 , 701+, especially 703 and 705 for ceramic
housing or package materials. (see Lines With Other Classes, "Composition
or Material," section B, above)
Gas and Liquid Contact Apparatus,
subclasses 94+ and 100+ for porous contact devices in
the form of a mass or sheet. (see Lines With Other Classes, "Composition
or Material," section B, above)
Plastic and Nonmetallic Article Shaping or Treating:
Processes, for processes of molding or shaping compositions of matter
which include significant molding or shaping operation. The line
between this class (501) and Class 264 is as follows: Class 501
takes processes of making compositions within the class definition
even though including the step of molding, when such step is claimed
broadly. Broad references to extruding, spinning into a setting
medium (without naming the medium) or sheeting in a claim to the
preparation of a composition of matter, are considered broad molding
steps. Also the statement that heat and pressure are used during
the molding, whether or not specific temperatures or specific pressures
are recited, is not considered sufficient of itself to take a patent
claiming a process of preparing a composition out of this class
(501). See especially
subclasses 239+ for shaping or molding a ceramic article; and digest
39 for processes of treating clay before and after molding. For
a detailed discussion of the line between Class 264 and the composition classes,
see the definitions of Class 264 and the notes to subclasses 603+ therein.
(Process/apparatus class)
Electrical Resistors, appropriate subclasses for electrical resistors
having ceramic material. (see Lines With Other Classes, "Composition or
Material," section B, above)
Optical: Systems and Elements, appropriate subclasses for articles of that class
having ceramic materials, especially glass, which may be classified,
per se, in this class (501). (see Lines With Other Classes, "Composition
or Material, section B, above)
Electricity: Electrical Systems and Devices,
subclass 320 and 321.1+ for fixed capacitors having
ceramic and glass materials. (see Lines With Other Classes, "Composition
or Material," section B, above)
Induced Nuclear Reactions: Processes, Systems,
and Elements,
subclasses 409+ for nuclear fuels with significant structural features
which may be made of a named ceramic composition. However, ceramic
compositions, per se, which may be useful to construct nuclear fuel
elements are classified in this class (501). (see Lines With Other
Classes, "Composition or Material," section B,
above)
Road Structure, Process, or Apparatus,
subclasses 17+ for preparation of pavements; and subclasses 72+ for
processes of preparing road structures which may involve a Class
501 composition. (see Lines With Other Classes, "Composition
or Material," section B, above)
Road Structure, Process, or Apparatus,
subclasses 75+ for processes of treating earth or a roadway in
situ including the application of a ceramic material thereto, and
see the note to Class 501 in the main class definition of Class 404.
(Process/apparatus class)
Hydraulic and Earth Engineering,
subclasses 263+ for processes and apparatus for chemical treatment
of earth formations in situ to condition the formation or to prevent
undesired movement thereof. (Process/apparatus class)
Chemical Apparatus and Process Disinfecting, Deodorizing,
Preserving, or Sterilizing,
subclasses 245.1+ for non-coating crystallization apparatus not including
means for chemical reaction not provided for elsewhere and subclasses
129+ for non-coating crystallization apparatus including
means for chemical reaction and not provided for elsewhere.(Process/apparatus
class)
Chemistry of Inorganic Compounds, appropriate subclasses for inorganic compound or
nonmetallic element disclosed or claimed having a utility in a Class
501 composition. (Compound class)
Plastic Article or Earthenware Shaping or Treating:
Apparatus, appropriate subclasses for apparatus for shaping
or treating ceramic compositions other than glass. (apparatus class)
Stock Material or Miscellaneous Articles,
subclasses 304.4+ for stock material containing one cellular or porous
component which may comprise a ceramic composition; subclass 426 for
nonstructural laminated stock material which includes a glass composition;
subclasses 446+ for nonstructural laminated stock material
which includes a composition including silicon or a compound of
silicon; and 539.5, for stock material containing free metal particles and
ceramic particles wherein there is a metal continuous phase interengaged
with a nonmetal continuous phase as a result, e.g., of a sintering operation.
(See Lines With Other Classes, "Composition or Material," section
B, above)
Stock Material or Miscellaneous Articles,
subclass 38 for glass containing wire mesh reinforcement; subclasses
426+ for plural layer stock material in which at least
one layer contains a glass; and subclass 539.5 for sintered compacts
comprising both metal or alloy particles and ceramic particles in
which there is present a metal continuous phase interengaged with
a ceramic continuous phase. (Special Class)
Chemistry: Electric Current Producing Apparatus,
Product, and Process,
subclasses 247+ for battery separators which may comprise a ceramic
material. (Process/apparatus class)
Chemistry: Electrical Current Producing Apparatus,
Product, and Process, appropriate subclasses for chemical current producing structures
which may comprise a ceramic component and for processes of producing
electric current by chemical means utilizing or producing a ceramic
composition. (See Lines With Other Classes, "Composition
or Material," section B, above)
Heating,
subclasses 1+ for a residual process of heating or calcining
an object or material which is clearly distinct from the composition and
for processes and apparatus for the firing of ceramic materials
not involving the shaping thereof. (Process/apparatus class)
Superconductor Technology: Apparatus, Material,
Process,
subclasses 100+ for high temperature (Tc
30 K) superconducting materials, per se, or subclasses 300+ for
processes of producing same. (See Lines With Other Classes, "Composition
or Material," section B, above)
Synthetic Resins or Natural Rubbers, the series for synthetic resin, per se, even though
such resin is disclosed or claimed as having a Class 501 utility.
A resin, per se, is one containing no intentional additive to
perfect it for a Class 501 purpose. See the remainder of the class (260)
for an organic compound having a Class 501 utility not provided
for elsewhere. This portion of Class 260 is being reclassified
into the 530 to 570 series of classes. See the search notes thereunder.
(Compound class)
Synthetic Resins or Natural Rubbers, for polymers of unsaturated monomers only, per se, even
if disclosed or claimed as having a Class 501 utility. (Compound
class)
Hazardous or Toxic Waste Destruction or Containment,
subclasses 249 through 260for the permanent containment and storage of hazardous
or toxic waste, particularly subclasses 252-253 which may involve
vitrification. (Process class)
SECTION IV - GLOSSARY
The meaning to be given to the various "art" terms appearing
in this class, but which have not been included in the Glossary
below, is the same as that generally accepted or in common usage.
However, certain terms employed in this class, which are included
below, have been assigned definitions tailored to meet the needs
of this class and therefore those may be more restricted or less
limited or even altogether different from those in common usage.
ALKALINE EARTH METAL
Alkaline Earth Metal is considered to be generic to calcium,
strontium, and barium. In this class (501), magnesium is not considered
to be an alkaline earth metal and compositions containing magnesium
compounds are generally provided for apart from those of alkaline
earth metals.
CERAMIC
Inorganic compositions which are heat treated to harden them
during their manufacture or subsequent use by firing, calcining,
sintering, or fusion of at least a portion of the inorganic material,
including glass compositions, fired clay compositions which form,
e.g., porcelain or brick, and refractories. Such materials typically,
but not necessarily, include earthy materials, such as metal (and especially
mixed metal) silicates.
CLAY
The naturally occurring earthy materials (or artificial compositions
having generally equivalent chemical and physical properties) containing
a substantial proportion (30 percent or more) of colloidal particles
(under .002mm.), and which becomes plastic when mixed with water
and which plastic material is capable of being hardened when fired
and containing a major proportion of hydrated aluminum silicates
which are derived by the weathering or decomposition of granite
or other feldspathic rock.
(1)
Note. Many natural materials are considered to be clays,
e.g., kaolin, fire clays, ball clays, china clays, bentonite, fuller"s
earth, bauxite, montmorillonite, halloysite, and argillaceous earths.
(2)
Note. Typical clay containing ceramic compositions or articles
are, e.g., common or face brick, structural blocks, porcelain bricks,
pottery, china, terra cotta, tile, sewer pipe, and some coating
and filling compositions.
EARTHENWARE, PORCELAIN
These terms designate fine grained or fully vitreous, high
fired white or translucent ceramic materials, frequently, but not
always containing clay or similar plastic components. Among many
terms used to designate somewhat similar materials are stoneware,
earthenware, porcelain, pottery, china, whiteware, tile, crockery,
sanitaryware, terra cotta, bisque, rakuware, and slip cast ware.
They are not intended for use in the high temperature or corrosive
environments where materials referred to as refractories are typically
employed.
FIBER
A slender, elongated structure of relatively small, uniform
diameter having a much greater length, which may have a relatively
short finite length or an indeterminate length.
FRIT
A glass composition in a powdered or granulated state prepared
by fusing the glass and quenching it in a cold liquid. Frits form
an important part of the batches used in compounding glazes and
enamels.
GLASS
Inorganic compositions which solidify from the molten state
without crystallizing, to have that molecular disorder characteristic
of the glass state, which have no definite melting point, are incapable
in the solid state of permanent deformation, which fracture when
subjected to deformation tension and include as components at least
one "glass former" material.
(1)
Note. Typical glass formers are, e.g., oxides of silicon,
beryllium, boron, germanium, phosphorus, vanadium, lead, tin, zinc,
zirconium, and titanium, as well as such nonoxide compounds as GeS,
metal fluorides, or iodides, and some metallic selenides, tellurides,
arsenides, and phosphides. These compositions may also include
other oxides devoid of glass forming tendencies, e.g., oxides of
alkali metals, alkaline earth metals, and magnesium.
(2)
Note. Many ceramic compositions containing primarily slag,
the by product of metal refining and smelting are considered to
be glasses.
(3)
Note. Neither transparency to light nor the absence of color
are necessary for a composition to be considered as a glass for
the purpose of this class.
(4)
Note. Water glass, clear synthetic resin compounds, and isinglass
are not considered to be glass for the purpose of classification
in Class 501.
(5)
Note. Organic, noncrystalline solid materials, such as synthetic
resins which may be referred to as organic glasses, are not considered
to be glass for the purpose of classification in Class 501.
PORE FORMING (POROUS, MULTICELLULAR)
These terms embrace porous compositions, compositions
intended to be further treated to make them porous or processes
for effecting the porosity or multicellularity. A positive step
for causing porosity must be recited and porosity which is the result
of including a naturally porous material in the composition is not
classified in the pore-forming subclasses of this class (501).
RARE EARTH ELEMENT
As used in this class (501), this term encompasses those elements
having atomic numbers from 57 through 71 inclusive, and 89+.
Thus, the following elements are herein treated as rare earth elements:
lanthanum, cerium, praesodymium, neodymium, promethium, samarium,
europium, gadolmium, terbium, dysprosium, holmium, erbium, thulium,
ytterbium, lutecium, actinium, thorium, protoactinium, uranium,
neptunium, and plutonium.
REFRACTORY
Compositions which are specifically formulated to be resistant
to abrasion, corrosion and physical or chemical disintegration when
subjected to high temperatures, chemically corrosive environments
and/or rapid temperature changes.
(1)
Note. Refractory materials are typically used to produce
furnace and kiln linings, fire brick, kiln furniture and saggers,
and pyroceramic cones.
(2)
Note. Among naturally occurring materials widely used in
making refractory products are, e.g., magnesite, dolomite, and chrome-
magnesite.
VITREOUS, VITRIFY
Vitrification is the progressive fusion of the particles
in a ceramic body. As vitrification progresses, the proportion
of glassy bond increases and the apparent porosity of the substance
decreases. Glass in a massive form (rather than in a frit or powder)
and porcelain are considered to be fully vitrified.
This subclass is indented under the class definition. Compositions other than Portland cement or cementitious
material prepared from gypsum, having an inorganic base, which are
heat treated to effect hardening or fusion followed by hardening
when cooled either during their manufacture or during subsequent
use by firing, calcining, sintering, or fusion of at least part
of the inorganic material, and processes not elsewhere classified
for their production.
(1)
Note. Included herein are glass compositions, refractory
materials employed in furnace and crucible walls, kiln-fired clay
products, and similar materials.
(2)
Note. Ceramic dielectrics, such as those containing barium
titanate, are classified in this or indented subclasses unless they are
disclosed or claimed as being piezoelectric, in which case, they
are classified in Class 252, Compositions, subclass 62.9, or in
Class 310, Electric Generator or Motor Structure, subclasses 8+ if
claimed as having a particular shape which is particular to the
piezoelectric property. If the ceramic dielectric is claimed or
disclosed broadly as having piezoelectric properties, the ceramic
dielectric is not classified here either as an original or a cross
reference, but is classified in appropriate class provided for the
piezoelectric composition, e.g., Class 252 or Class 310 as noted above.
Static Structures (e.g., Buildings), appropriate subclasses for cast monoliths or ceramic
members characterized by significant structural configuration.
Specialized Metallurgical Processes, Compositions
for Use Therein, Consolidated Metal Powder Compositions, and Loose
Metal Particulate Mixtures,
subclasses 228+ for consolidated compositions of metals or alloys
including those containing ceramic or refractory or other nonmetallic
components, e.g. cermets.
Compositions: Coating or Plastic,
subclasses 739+ for the making of Portland cement; subclasses 772+ for the
preparation of cementitious materials from gypsum; and subclass
313 for fluxes which are to be used in the production of ceramic
compositions.
Plastic and Nonmetallic Article Shaping or Treating:
Processes, appropriate subclass for processes, within the class definition,
including a significant molding operation or a significant treatment
of a molded article. In particular, see
subclass 30 , 31+, 43+, 125, and 603+ therein.
For a detailed discussion of the line between Class 264 and the
composition classes, see the definitions of Class 264 and the notes
to subclasses 56+ therein.
This subclass is indented under subclass 1. Compositions containing a crystalline phase embedded in
a glassy (amorphous) phase, which crystalline phase is produced
by cooling a molten glass composition to a temperature which causes
a portion only of the composition to crystallize while the remainder
of the composition (the matrix) solidifies in the amorphous or glassy
state.
(1)
Note. The crystalline phase is typically uniformly dispersed
throughout the glassy phase and it must constitute at least 50 percent
by weight of the total composition.
(2)
Note. The subclasses indented hereunder are established on
the basis of the nature of the crystalline phase. Patents placed
as originals in the indented subclasses may be cross-referenced
when appropriate in other subclasses of this class on the basis
of the nature of the glassy matrix phase.
(3)
Note. Documents classified as originals in this and indented
subclasses are cross-referenced on the basis of the chemical nature
of the glass composition disclosed into subclasses 40, 41+,
and/or 53+, as appropriate.
(4)
Note. Documents classified as originals in this and indented
subclass which are directed to optical glass compositions are cross-referenced
to subclasses 900+.
This subclass is indented under subclass 2. Subject matter wherein the crystalline phase comprises silicates
of two or more metals.
(1)
Note. The crystalline phase may comprise, e.g., diopside
(CaMgSiO6), sphene (CaTiSiO5),
plagioclase (atriclinic feldspar), a slagceram free of Al2O3,
etc.
This subclass is indented under subclass 5. Compositions in which the silicate comprises a divalent
metal oxide aluminosilicate.
(1)
Note. The silicate may be an aluminosilicate of an alkaline
earth metal, magnesium, zinc, or zirconium, e.g., anorthite (CaAl2Si2O3),
a slagceram, etc.
This subclass is indented under subclass 1. Compositions which comprise a glass or compositions intended
to be heat treated so as to form a glass.
(1)
Note. To be classified herein, the chemical nature of the
glass composition must be unspecified.
(2)
Note. A typical disclosure appropriate for this subclass
might be, e.g., a product by process claim, etc.
(3)
Note. Compositions containing both glass and nonglass materials
in which the glass serves merely as a binder for particles of the
other material are not included herein, but are classified on some
other basis.
(4)
Note. This and indented subclasses include compositions of
enamels and glazes, etc., which are glasses.
(5)
Note. Documents classified as originals in this and indented
subclasses which disclose optical glass compositions are cross-referenced
in subclasses 900+.
Receptacles,
subclasses 2.1+ for envelopes for electric lamps, electronic tubes
and similar devices which are made of glass. Where no more is claimed
than an envelope of a specific composition of glass the patent is classified
in this class (501). Where the composition is claimed and also some
structure of the envelope, the patent is classified in Class 220.
This subclass is indented under subclass 11. Compositions which have been prepared by a method other
than melting including at least one step in which the glass forming
ingredients are in a gel or sol state, and glass making processes
involving such a step.
(1)
Note. Documents classified as originals in this subclass
are cross-referenced on the basis of the chemical nature of the glass
composition disclosed into subclasses 40, 41+, and/or
53+, as appropriate.
(2)
Note. Documents classified as originals in this subclass
which disclose optical glass compositions are cross-referenced in
subclasses 900+.
Colloid Systems and Wetting Agents; Subcombinations
Thereof; Processes of Making, Stabilizing, Breaking, or Inhibiting,
subclasses 98+ for colloid systems of continuous or semicontinuous
solid phase with discontinuous liquid phase (gels, pastes, flocs,
coagulates) or agents for such systems or making or stabilizing
such systems or agents, when generically claimed or when there is
no hierarchically superior provision in the USPC for the specifically
claimed art.
This subclass is indented under subclass 11. Compositions which are capable of reversibly changing color
or darkening in response to the presence of electromagnetic radiation
and which if darkened thereby fade when the electromagnetic radiation
is removed.
(1)
Note. Documents classified as originals in this subclass
are cross-referenced on the basis of the chemical nature of the glass
composition disclosed into subclasses 40, 41+, and/or
53+, as appropriate.
(2)
Note. Documents classified as originals in this subclass
which disclose optical glass compositions are cross-referenced in
subclasses 900+.
This subclass is indented under subclass 11. Compositions disclosed as vitreous enamels, or glazes, or
similar compositions which are intended for use as seals between
glass and/or metal components of various devices.
(1)
Note. The compositions in this and indented subclasses have
typically been cross-referenced below on the basis of their specific
ingredient content, e.g., to subclasses 21+ for frit compositions, subclass
40 for nonoxide glasses, subclasses 41+ for nonsilica and
nonsilicate containing oxide glasses, and subclasses 53+ for
Si02 containing glasses.
(2)
Note. Documents classified as originals in this and indented
subclasses which disclose optical glass compositions are cross-referenced
in subclasses 900+.
Synthetic Resins or Natural Rubbers, appropriate subclasses, particularly
subclass 170 for a composition containing a synthetic resin
or Natural Rubbers and having utility as an enamel composition for
glass or for a medium or binder in the preparation of glass enamel
or to processes of preparing said composition.
This subclass is indented under subclass 14. Compositions disclosed for use as seals between other ceramic
glass, and/or metal components of various devices, and
containing a frit plus some other ingredient which is not a glass.
(1)
Note. These compositions are sometimes disclosed as glass
solders.
This subclass is indented under subclass 14. Compositions which comprise a frit pulse at least one other
material which is not a glass.
(1)
Note. The other material may be, e.g., an opacifying agent,
a coloring agent, or any material added during the milling or other
comminuting operation to enhance that process or to improve the
properties of the product of that process.
This subclass is indented under subclass 17. Subject matter in which the other material is a free metal.
(1)
Note. The free metal may be, e.g., in the form of copper
flakes, aluminum powder, etc.
(2)
Note. See the class definition of this class (501) for the
general lines between this class and other composition classes relative
to cermets, powder metallurgy compacts and similar materials.
This subclass is indented under subclass 27. Compositions which include at least one ingredient in the
form of shaped particles, e.g., pellets, granules, briquettes, nodules,
etc.
This subclass is indented under subclass 11. Compositions which contain a glass and at least one ingredient
which is not a glass, wherein the nonglass ingredient is not dissolved
in the glass.
(1)
Note. This subclass includes such materials as, e.g., two
phase glasses, opal glass, crystal glass, etc.
(2)
Note. Documents classified as originals in this subclass
are cross-referenced on the basis of the chemical nature of the glass
composition disclosed into subclasses 40, 41+, and/or
53+ as appropriate.
(3)
Note. Documents classified as originals in this subclass
which disclose optical glass compositions are cross-referenced in
subclasses 900+.
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