US Patent Class 138
PIPES AND TUBULAR CONDUITS-- Main Headings




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Current as of: June, 1999
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CLASS NOTES
26  DF  WITH PRESSURE COMPENSATORS {2}
32  DF  THAWING AND FREEZE PROTECTION {3}
36  DF  WITH WEAR INDICATOR
37  DF  WITH FLOW REGULATORS AND/OR BAFFLES {3}
89  DF  WITH CLOSURES AND PLUGS {7}
96 R  DF  END PROTECTORS {1}
97  DF  REPAIRING {1}
100  DF  BREAKJOINT {2}
103  DF  COMBINED {6}
111  DF  PLURAL DUCT {4}
118  DF  FLEXIBLE {8}
140  DF  DISTINCT LAYERS {8}
154  DF  SPIRALLY SEAMED
155  DF  JOINED SECTIONS
156  DF  LONGITUDINALLY SEAMED {8}
172  DF  REINFORCED {2}
177  DF  STRUCTURE
178  DF  MISCELLANEOUS
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DIGESTS
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DIG 1  DF  Adhesive
DIG 2  DF  Glass fiber
DIG 3  DF  Teflon, Kel-F
DIG 4  DF  Air conditioning
DIG 5  DF  Pre-stress
DIG 6  DF  Corrosion
DIG 7  DF  Resins
DIG 8  DF  Bent shaped retained
DIG 9  DF  Cellular
DIG 10  DF  Metal foil
DIG 11  DF  Shape