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[Search a list of Patent Appplications for class 137]  Class   137FLUID HANDLING
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   [List of Patents for class 137 subclass 1]  1           PROCESSES
   [List of Patents for class 137 subclass 2]  2           Subclass 2 indent level is 1 With control of flow by a condition or characteristic of a fluid
   [List of Patents for class 137 subclass 3]  3           Subclass 3 indent level is 2 Mixing of plural fluids of diverse characteristics or conditions
    [List of Patents for class 137 subclass 4]  4           Subclass 4 indent level is 3 Controlled by consistency of mixture
    [List of Patents for class 137 subclass 5]  5           Subclass 5 indent level is 3 Controlled by conductivity of mixture
    [List of Patents for class 137 subclass 6]  6           Subclass 6 indent level is 3 Controlled by heat of combustion of mixture
    [List of Patents for class 137 subclass 7]  7           Subclass 7 indent level is 3 Controlled by pressure
    [List of Patents for class 137 subclass 8]  8           Subclass 8 indent level is 2 For producing uniform flow
    [List of Patents for class 137 subclass 9]  9           Subclass 9 indent level is 2 For producing proportionate flow
    [List of Patents for class 137 subclass 10]  10           Subclass 10 indent level is 2 By speed of fluid
    [List of Patents for class 137 subclass 11]  11           Subclass 11 indent level is 2 For regulating boiler feed water level
    [List of Patents for class 137 subclass 12]  12           Subclass 12 indent level is 2 By fluid pressure
    [List of Patents for class 137 subclass 12.5]  12.5           Subclass 12.5 indent level is 1 Carbonated beverage handling processes
    [List of Patents for class 137 subclass 13]  13           Subclass 13 indent level is 1 Affecting flow by the addition of material or energy
    [List of Patents for class 137 subclass 14]  14           Subclass 14 indent level is 1 Involving pressure control
   [List of Patents for class 137 subclass 15.01]  15.01           Subclass 15.01 indent level is 1 Cleaning, repairing, or assembling
    [List of Patents for class 137 subclass 15.02]  15.02           Subclass 15.02 indent level is 2 Repairing or assembling hydrant (e.g., fireplug, etc.)
    [List of Patents for class 137 subclass 15.03]  15.03           Subclass 15.03 indent level is 2 Gas or water meter repairing or assembling
   [List of Patents for class 137 subclass 15.04]  15.04           Subclass 15.04 indent level is 2 Fluid cleaning or flushing
   [List of Patents for class 137 subclass 15.05]  15.05           Subclass 15.05 indent level is 3 Liquid cleaning or flushing
    [List of Patents for class 137 subclass 15.06]  15.06           Subclass 15.06 indent level is 4 Valve or valve seat cleaning
    [List of Patents for class 137 subclass 15.07]  15.07           Subclass 15.07 indent level is 2 Mechanical cleaning (e.g., pig, etc.)
   [List of Patents for class 137 subclass 15.08]  15.08           Subclass 15.08 indent level is 2 Repairing, securing, replacing, or servicing pipe joint, valve, or tank
   [List of Patents for class 137 subclass 15.18]  15.18           Subclass 15.18 indent level is 2 Valve or valve element assembling, disassembling, or replacing
    [List of Patents for class 137 subclass 15.19]  15.19           Subclass 15.19 indent level is 3 Fluid actuated or retarded
    [List of Patents for class 137 subclass 15.21]  15.21           Subclass 15.21 indent level is 3 Multi way valve
    [List of Patents for class 137 subclass 15.22]  15.22           Subclass 15.22 indent level is 3 Ball valve or rotary ball valve
    [List of Patents for class 137 subclass 15.23]  15.23           Subclass 15.23 indent level is 3 Gate valve
    [List of Patents for class 137 subclass 15.24]  15.24           Subclass 15.24 indent level is 3 Plug valve
    [List of Patents for class 137 subclass 15.25]  15.25           Subclass 15.25 indent level is 3 Butterfly valve
    [List of Patents for class 137 subclass 15.26]  15.26           Subclass 15.26 indent level is 3 Float valve
   [List of Patents for class 137 subclass 15.1]  15.1           HIGHSPEED FLUID INTAKE MEANS (E.G., JET ENGINE INTAKE)
    [List of Patents for class 137 subclass 15.2]  15.2           Subclass 15.2 indent level is 1 With condition responsive control means
   [List of Patents for class 137 subclass 38]  38           CONTROL BY CHANGE OF POSITION OR INERTIA OF SYSTEM
    [List of Patents for class 137 subclass 39]  39           Subclass 39 indent level is 1 With second control
   [List of Patents for class 137 subclass 40]  40           Subclass 40 indent level is 1 Position relative body of water (e.g., marine governors)
    [List of Patents for class 137 subclass 41]  41           Subclass 41 indent level is 2 Float controlled
    [List of Patents for class 137 subclass 42]  42           Subclass 42 indent level is 2 Pressure or head controlled
    [List of Patents for class 137 subclass 43]  43           Subclass 43 indent level is 1 Vent opening or closing on tipping container
    [List of Patents for class 137 subclass 44]  44           Subclass 44 indent level is 1 By shifting of liquid level
   [List of Patents for class 137 subclass 45]  45           Subclass 45 indent level is 1 By pendulum or swinging member
    [List of Patents for class 137 subclass 46]  46           Subclass 46 indent level is 2 With servo connection to valve
   [List of Patents for class 137 subclass 47]  47           SPEED RESPONSIVE VALVE CONTROL
    [List of Patents for class 137 subclass 48]  48           Subclass 48 indent level is 1 Acceleration responsive valve control
    [List of Patents for class 137 subclass 49]  49           Subclass 49 indent level is 1 With manual valve control
    [List of Patents for class 137 subclass 50]  50           Subclass 50 indent level is 1 Speed change and excess speed valve control
   [List of Patents for class 137 subclass 51]  51           Subclass 51 indent level is 1 With other condition responsive valve control
    [List of Patents for class 137 subclass 52]  52           Subclass 52 indent level is 2 Governor drive failure responsive
   [List of Patents for class 137 subclass 53]  53           Subclass 53 indent level is 1 Centrifugal mass type (exclusive of liquid)
    [List of Patents for class 137 subclass 54]  54           Subclass 54 indent level is 2 With multiple valves
    [List of Patents for class 137 subclass 55]  55           Subclass 55 indent level is 2 Periodically actuated valve
    [List of Patents for class 137 subclass 56]  56           Subclass 56 indent level is 2 Rotating valve and rotating governor
    [List of Patents for class 137 subclass 57]  57           Subclass 57 indent level is 2 Excess speed responsive
    [List of Patents for class 137 subclass 58]  58           Subclass 58 indent level is 2 With fluid servo-motor
   [List of Patents for class 137 subclass 59]  59           FREEZE CONDITION RESPONSIVE SAFETY SYSTEMS
    [List of Patents for class 137 subclass 60]  60           Subclass 60 indent level is 1 With freeze waste
    [List of Patents for class 137 subclass 61]  61           Subclass 61 indent level is 1 Stop and waste
    [List of Patents for class 137 subclass 62]  62           Subclass 62 indent level is 1 Low temperature responsive drains
   [List of Patents for class 137 subclass 65]  65           COMBUSTION FAILURE RESPONSIVE FUEL SAFETY CUT-OFF FOR BURNERS
    [List of Patents for class 137 subclass 66]  66           Subclass 66 indent level is 1 Thermo-electric
   [List of Patents for class 137 subclass 67]  67           DESTRUCTIBLE OR DEFORMABLE ELEMENT CONTROLLED
   [List of Patents for class 137 subclass 68.11]  68.11           Subclass 68.11 indent level is 1 Destructible element
    [List of Patents for class 137 subclass 68.12]  68.12           Subclass 68.12 indent level is 2 Combined destructible and fusible element
    [List of Patents for class 137 subclass 68.13]  68.13           Subclass 68.13 indent level is 2 Explosive actuation
   [List of Patents for class 137 subclass 68.14]  68.14           Subclass 68.14 indent level is 2 Separable valve coupling or conduit
    [List of Patents for class 137 subclass 68.15]  68.15           Subclass 68.15 indent level is 3 Tensile or sheer pin or bolt
   [List of Patents for class 137 subclass 68.16]  68.16           Subclass 68.16 indent level is 2 Tensile or sheer pin or bolt
    [List of Patents for class 137 subclass 68.18]  68.18           Subclass 68.18 indent level is 2 With alarm or indicator
   [List of Patents for class 137 subclass 68.19]  68.19           Subclass 68.19 indent level is 2 Rupture disc
    [List of Patents for class 137 subclass 68.21]  68.21           Subclass 68.21 indent level is 3 Means for holding entire disc after rupture
    [List of Patents for class 137 subclass 68.22]  68.22           Subclass 68.22 indent level is 3 Disc burst after destruction of additional element
   [List of Patents for class 137 subclass 68.23]  68.23           Subclass 68.23 indent level is 3 Direct pressure causes disc to burst
    [List of Patents for class 137 subclass 68.24]  68.24           Subclass 68.24 indent level is 4 Two-way rupture disc
   [List of Patents for class 137 subclass 68.25]  68.25           Subclass 68.25 indent level is 4 Dome shape
    [List of Patents for class 137 subclass 68.26]  68.26           Subclass 68.26 indent level is 5 Reverse buckling
    [List of Patents for class 137 subclass 68.27]  68.27           Subclass 68.27 indent level is 3 Specific weakening point
    [List of Patents for class 137 subclass 68.28]  68.28           Subclass 68.28 indent level is 3 Integral disc assembly
   [List of Patents for class 137 subclass 68.29]  68.29           Subclass 68.29 indent level is 3 Knife or cutter causes disc to break
    [List of Patents for class 137 subclass 68.3]  68.3           Subclass 68.3 indent level is 4 Movable knife or cutter
    [List of Patents for class 137 subclass 69]  69           Subclass 69 indent level is 2 With counterbalancing element
    [List of Patents for class 137 subclass 70]  70           Subclass 70 indent level is 2 Frangible element returns pressure responsive valve
    [List of Patents for class 137 subclass 71]  71           Subclass 71 indent level is 2 Having pressure responsive valve
   [List of Patents for class 137 subclass 72]  72           Subclass 72 indent level is 1 Heat destructible or fusible
    [List of Patents for class 137 subclass 73]  73           Subclass 73 indent level is 2 With second sensing means
    [List of Patents for class 137 subclass 74]  74           Subclass 74 indent level is 2 In fluid flow path
   [List of Patents for class 137 subclass 75]  75           Subclass 75 indent level is 2 Safety cut-off
   [List of Patents for class 137 subclass 78.1]  78.1           AMBIENT CONDITION CHANGE RESPONSIVE
   [List of Patents for class 137 subclass 78.2]  78.2           Subclass 78.2 indent level is 1 For controlling soil irrigation
    [List of Patents for class 137 subclass 78.3]  78.3           Subclass 78.3 indent level is 2 Soil moisture sensing
    [List of Patents for class 137 subclass 78.4]  78.4           Subclass 78.4 indent level is 1 Burner gas cutoff
   [List of Patents for class 137 subclass 78.5]  78.5           Subclass 78.5 indent level is 1 Atmospheric
   [List of Patents for class 137 subclass 79]  79           Subclass 79 indent level is 2 Temperature
    [List of Patents for class 137 subclass 80]  80           Subclass 80 indent level is 3 With additional diverse control
    [List of Patents for class 137 subclass 81.1]  81.1           Subclass 81.1 indent level is 2 Pressure
    [List of Patents for class 137 subclass 81.2]  81.2           Subclass 81.2 indent level is 1 Underwater
   [List of Patents for class 137 subclass 803]  803           FLOW AFFECTED BY FLUID CONTACT, ENERGY FIELD OR COANDA EFFECT (E.G., PURE FLUID DEVICE OR SYSTEM)
   [List of Patents for class 137 subclass 804]  804           Subclass 804 indent level is 1 Responsive to condition external of system