USPC Patent Classifications

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Class 138 pipes and tubular conduits
uspcdescription
138/26138 pipes and tubular conduits/(26) with pressure compensators
138/27138 pipes and tubular conduits/(26) with pressure compensators (27) freeze protecting
138/28138 pipes and tubular conduits/(26) with pressure compensators (27) freeze protecting (28) expansible or compressible tube element
138/30138 pipes and tubular conduits/(26) with pressure compensators (30) variable capacity chambers
138/31138 pipes and tubular conduits/(26) with pressure compensators (30) variable capacity chambers (31) piston or plunger type
138/32138 pipes and tubular conduits/(32) thawing and freeze protection
138/33138 pipes and tubular conduits/(32) thawing and freeze protection (33) electric
138/34138 pipes and tubular conduits/(32) thawing and freeze protection (34) anti-freeze substance
138/35138 pipes and tubular conduits/(32) thawing and freeze protection (35) portable thawing apparatus
138/36138 pipes and tubular conduits/(36) with wear indicator
138/37138 pipes and tubular conduits/(37) with flow regulators and/or baffles
138/38138 pipes and tubular conduits/(37) with flow regulators and/or baffles (38) heat transfer
138/39138 pipes and tubular conduits/(37) with flow regulators and/or baffles (39) flow facilitating
138/40138 pipes and tubular conduits/(37) with flow regulators and/or baffles (40) restrictors
138/41138 pipes and tubular conduits/(37) with flow regulators and/or baffles (40) restrictors (41) with screen
138/42138 pipes and tubular conduits/(37) with flow regulators and/or baffles (40) restrictors (42) tortuous path
138/43138 pipes and tubular conduits/(37) with flow regulators and/or baffles (40) restrictors (42) tortuous path (43) variable restriction
138/44138 pipes and tubular conduits/(37) with flow regulators and/or baffles (40) restrictors (44) central path
138/45138 pipes and tubular conduits/(37) with flow regulators and/or baffles (40) restrictors (44) central path (45) variable restriction
138/46138 pipes and tubular conduits/(37) with flow regulators and/or baffles (40) restrictors (46) variable restriction
138/89138 pipes and tubular conduits/(89) with closures and plugs
138/89.1138 pipes and tubular conduits/(89) with closures and plugs () inflation stem type (89.1) air and dust cap
138/89.2138 pipes and tubular conduits/(89) with closures and plugs () inflation stem type (89.1) air and dust cap (89.2) combined
138/89.3138 pipes and tubular conduits/(89) with closures and plugs () inflation stem type (89.3) air cap
138/89.4138 pipes and tubular conduits/(89) with closures and plugs () inflation stem type (89.4) dust cap
138/90138 pipes and tubular conduits/(89) with closures and plugs (90) test plugs
138/91138 pipes and tubular conduits/(89) with closures and plugs (91) double end
138/92138 pipes and tubular conduits/(89) with closures and plugs (92) lateral opening
138/93138 pipes and tubular conduits/(89) with closures and plugs (93) inflatable
138/94138 pipes and tubular conduits/(89) with closures and plugs (94) laterally insertable
138/94.3138 pipes and tubular conduits/(89) with closures and plugs (94) laterally insertable (94.3) line blinds
138/94.5138 pipes and tubular conduits/(89) with closures and plugs (94) laterally insertable (94.3) line blinds (94.5) pivoted
138/95138 pipes and tubular conduits/(89) with closures and plugs (95) return bend type
138/96R138 pipes and tubular conduits/(96r) end protectors
138/96T138 pipes and tubular conduits/(96r) end protectors (96t) threaded
138/97138 pipes and tubular conduits/(97) repairing
138/98138 pipes and tubular conduits/(97) repairing (98) patches
138/99138 pipes and tubular conduits/(97) repairing (98) patches (99) external
138/100138 pipes and tubular conduits/(100) breakjoint
138/101138 pipes and tubular conduits/(100) breakjoint (101) distinct layers
138/102138 pipes and tubular conduits/(100) breakjoint (102) with base
138/103138 pipes and tubular conduits/(103) combined
138/104138 pipes and tubular conduits/(103) combined (104) with indicating means
138/105138 pipes and tubular conduits/(103) combined (105) with trench
138/106138 pipes and tubular conduits/(103) combined (106) with external support structure
138/107138 pipes and tubular conduits/(103) combined (106) with external support structure (107) suspended
138/108138 pipes and tubular conduits/(103) combined (108) with means to support disparate element therein
138/109138 pipes and tubular conduits/(103) combined (109) with end structure
138/110138 pipes and tubular conduits/(103) combined (110) with hose protector
138/111138 pipes and tubular conduits/(111) plural duct
138/112138 pipes and tubular conduits/(111) plural duct (112) with spacer and encircling element
138/113138 pipes and tubular conduits/(111) plural duct (113) surrounding radially spaced duct with axially spaced supports for internal duct
138/114138 pipes and tubular conduits/(111) plural duct (114) coaxial
138/115138 pipes and tubular conduits/(111) plural duct (115) longitudinally extending common wall
138/116138 pipes and tubular conduits/(111) plural duct (115) longitudinally extending common wall (116) distinct
138/117138 pipes and tubular conduits/(111) plural duct (115) longitudinally extending common wall (117) complementary sections
138/118138 pipes and tubular conduits/(118) flexible
138/118.1138 pipes and tubular conduits/(118) flexible (118.1) casing
138/119138 pipes and tubular conduits/(118) flexible (119) with means for facilitating collapse
138/120138 pipes and tubular conduits/(118) flexible (120) joined sections
138/121138 pipes and tubular conduits/(118) flexible (121) corrugated
138/122138 pipes and tubular conduits/(118) flexible (121) corrugated (122) spirally
138/123138 pipes and tubular conduits/(118) flexible (123) braided, interlaced, knitted or woven
138/124138 pipes and tubular conduits/(118) flexible (123) braided, interlaced, knitted or woven (124) distinct layers
138/125138 pipes and tubular conduits/(118) flexible (123) braided, interlaced, knitted or woven (124) distinct layers (125) plastic
138/126138 pipes and tubular conduits/(118) flexible (123) braided, interlaced, knitted or woven (124) distinct layers (125) plastic (126) rubber
138/127138 pipes and tubular conduits/(118) flexible (123) braided, interlaced, knitted or woven (124) distinct layers (125) plastic (126) rubber (127) with metal
138/128138 pipes and tubular conduits/(118) flexible (128) longitudinally seamed
138/129138 pipes and tubular conduits/(118) flexible (129) spirally wound material
138/130138 pipes and tubular conduits/(118) flexible (129) spirally wound material (130) oppositely wound
138/131138 pipes and tubular conduits/(118) flexible (129) spirally wound material (131) metal core
138/132138 pipes and tubular conduits/(118) flexible (129) spirally wound material (132) embedded
138/133138 pipes and tubular conduits/(118) flexible (129) spirally wound material (132) embedded (133) metal
138/134138 pipes and tubular conduits/(118) flexible (129) spirally wound material (134) metal
138/135138 pipes and tubular conduits/(118) flexible (129) spirally wound material (134) metal (135) with interlocked or clamped edge
138/136138 pipes and tubular conduits/(118) flexible (129) spirally wound material (134) metal (135) with interlocked or clamped edge (136) packed or sealed
138/137138 pipes and tubular conduits/(118) flexible (137) distinct layers
138/138138 pipes and tubular conduits/(118) flexible (137) distinct layers (138) with intermediate metal element
138/139138 pipes and tubular conduits/(118) flexible (137) distinct layers (139) metal liner
138/140138 pipes and tubular conduits/(140) distinct layers
138/141138 pipes and tubular conduits/(140) distinct layers (141) bonded to each other
138/142138 pipes and tubular conduits/(140) distinct layers (141) bonded to each other (142) brazed, soldered or welded
138/143138 pipes and tubular conduits/(140) distinct layers (141) bonded to each other (143) metal
138/144138 pipes and tubular conduits/(140) distinct layers (141) bonded to each other (144) spirally wound layer
138/145138 pipes and tubular conduits/(140) distinct layers (145) coated
138/146138 pipes and tubular conduits/(140) distinct layers (145) coated (146) diverse coating material
138/147138 pipes and tubular conduits/(140) distinct layers (147) with mechanical means to hold layers in contact
138/148138 pipes and tubular conduits/(140) distinct layers (148) spaced
138/149138 pipes and tubular conduits/(140) distinct layers (149) with intermediate insulation layer
138/150138 pipes and tubular conduits/(140) distinct layers (150) with spiral seam
138/151138 pipes and tubular conduits/(140) distinct layers (151) with longitudinal seam
138/152138 pipes and tubular conduits/(140) distinct layers (151) with longitudinal seam (152) material of one layer passing through seam
138/153138 pipes and tubular conduits/(140) distinct layers (153) reinforced
138/154138 pipes and tubular conduits/(154) spirally seamed
138/155138 pipes and tubular conduits/(155) joined sections
138/156138 pipes and tubular conduits/(156) longitudinally seamed
138/157138 pipes and tubular conduits/(156) longitudinally seamed (157) sectional
138/158138 pipes and tubular conduits/(156) longitudinally seamed (157) sectional (158) with separate mechanical securing means
138/159138 pipes and tubular conduits/(156) longitudinally seamed (157) sectional (158) with separate mechanical securing means (159) bolt, nail, rivet or screw
138/160138 pipes and tubular conduits/(156) longitudinally seamed (157) sectional (158) with separate mechanical securing means (159) bolt, nail, rivet or screw (160) radially extending
138/161138 pipes and tubular conduits/(156) longitudinally seamed (157) sectional (158) with separate mechanical securing means (161) externally encircling
138/162138 pipes and tubular conduits/(156) longitudinally seamed (157) sectional (162) tongue and slot
138/163138 pipes and tubular conduits/(156) longitudinally seamed (157) sectional (163) bent over lip or flange
138/164138 pipes and tubular conduits/(156) longitudinally seamed (164) with packing
138/165138 pipes and tubular conduits/(156) longitudinally seamed (165) with wedge
138/166138 pipes and tubular conduits/(156) longitudinally seamed (166) with tongue in slot
138/167138 pipes and tubular conduits/(156) longitudinally seamed (167) with diverse locking means
138/168138 pipes and tubular conduits/(156) longitudinally seamed (168) with interlocking hooks
138/169138 pipes and tubular conduits/(156) longitudinally seamed (169) diversity of seam
138/170138 pipes and tubular conduits/(156) longitudinally seamed (170) permanent type seam
138/171138 pipes and tubular conduits/(156) longitudinally seamed (170) permanent type seam (171) brazed, soldered or welded
138/172138 pipes and tubular conduits/(172) reinforced
138/173138 pipes and tubular conduits/(172) reinforced (173) corrugated
138/174138 pipes and tubular conduits/(172) reinforced (174) with embedded element
138/175138 pipes and tubular conduits/(172) reinforced (174) with embedded element (175) clay, concrete or masonry
138/176138 pipes and tubular conduits/(172) reinforced (174) with embedded element (175) clay, concrete or masonry (176) reinforcement under tension
138/177138 pipes and tubular conduits/(177) structure
138/178138 pipes and tubular conduits/(178) miscellaneous

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