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Classification Resources
 
Class   138PIPES AND TUBULAR CONDUITS
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[List of Pre Grant Publications for class 138 subclass 26][List of Patents for class 138 subclass 26]26 WITH PRESSURE COMPENSATORS
[List of Pre Grant Publications for class 138 subclass 32][List of Patents for class 138 subclass 32]32 THAWING AND FREEZE PROTECTION
 [List of Pre Grant Publications for class 138 subclass 36][List of Patents for class 138 subclass 36]36 WITH WEAR INDICATOR
[List of Pre Grant Publications for class 138 subclass 37][List of Patents for class 138 subclass 37]37 WITH FLOW REGULATORS AND/OR BAFFLES
[List of Pre Grant Publications for class 138 subclass 89][List of Patents for class 138 subclass 89]89 WITH CLOSURES AND PLUGS
[List of Pre Grant Publications for class 138 subclass 96R][List of Patents for class 138 subclass 96R]  96R END PROTECTORS
[List of Pre Grant Publications for class 138 subclass 97][List of Patents for class 138 subclass 97]97 REPAIRING
[List of Pre Grant Publications for class 138 subclass 100][List of Patents for class 138 subclass 100]100 BREAKJOINT
[List of Pre Grant Publications for class 138 subclass 103][List of Patents for class 138 subclass 103]103 COMBINED
[List of Pre Grant Publications for class 138 subclass 111][List of Patents for class 138 subclass 111]111 PLURAL DUCT
[List of Pre Grant Publications for class 138 subclass 118][List of Patents for class 138 subclass 118]118 FLEXIBLE
[List of Pre Grant Publications for class 138 subclass 140][List of Patents for class 138 subclass 140]140 DISTINCT LAYERS
 [List of Pre Grant Publications for class 138 subclass 154][List of Patents for class 138 subclass 154]154 SPIRALLY SEAMED
 [List of Pre Grant Publications for class 138 subclass 155][List of Patents for class 138 subclass 155]155 JOINED SECTIONS
[List of Pre Grant Publications for class 138 subclass 156][List of Patents for class 138 subclass 156]156 LONGITUDINALLY SEAMED
[List of Pre Grant Publications for class 138 subclass 172][List of Patents for class 138 subclass 172]172 REINFORCED
 [List of Pre Grant Publications for class 138 subclass 177][List of Patents for class 138 subclass 177]177 STRUCTURE
 [List of Pre Grant Publications for class 138 subclass 178][List of Patents for class 138 subclass 178]178 MISCELLANEOUS
 
FOREIGN ART COLLECTIONS
 
      FOR000          CLASS-RELATED FOREIGN DOCUMENTS
 
DIGESTS
 
 [List of Pre Grant Publications for class 138 subclass DIG1][List of Patents for class 138 subclass DIG1] DIG1 ADHESIVE
 [List of Pre Grant Publications for class 138 subclass DIG2][List of Patents for class 138 subclass DIG2] DIG2 GLASS FIBER
 [List of Pre Grant Publications for class 138 subclass DIG3][List of Patents for class 138 subclass DIG3] DIG3 TEFLON™, KEL-F
 [List of Pre Grant Publications for class 138 subclass DIG4][List of Patents for class 138 subclass DIG4] DIG4 AIR CONDITIONING
 [List of Pre Grant Publications for class 138 subclass DIG5][List of Patents for class 138 subclass DIG5] DIG5 PRE-STRESS
 [List of Pre Grant Publications for class 138 subclass DIG6][List of Patents for class 138 subclass DIG6] DIG6 CORROSION
 [List of Pre Grant Publications for class 138 subclass DIG7][List of Patents for class 138 subclass DIG7] DIG7 RESINS
 [List of Pre Grant Publications for class 138 subclass DIG8][List of Patents for class 138 subclass DIG8] DIG8 BENT SHAPED RETAINED
 [List of Pre Grant Publications for class 138 subclass DIG9][List of Patents for class 138 subclass DIG9] DIG9 CELLULAR
 [List of Pre Grant Publications for class 138 subclass DIG10][List of Patents for class 138 subclass DIG10] DIG10 METAL FOIL
 [List of Pre Grant Publications for class 138 subclass DIG11][List of Patents for class 138 subclass DIG11] DIG11 SHAPE