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Construction
Class Information
Number:
138/252.5
Name:
Pipes and tubular conduits
>
Description:
Sub-classes under this class:
Class Number
Class Name
Patents
138/100
Breakjoint
9
138/103
Combined
361
138/111
Plural duct
215
138/118
Flexible
218
138/140
Distinct layers
331
138/154
Spirally seamed
163
138/155
Joined sections
376
138/156
Longitudinally seamed
164
138/172
Reinforced
266
138/177
Structure
524
138/178
Miscellaneous
389
138/26
With pressure compensators
248
138/32
Thawing and freeze protection
82
138/36
With wear indicator
18
138/37
With flow regulators and/or baffles
235
138/89
With closures and plugs
961
138/96R
End protectors
246
138/97
Repairing
811
138/DIG.1
Adhesive
94
138/DIG.10
Metal foil
18
138/DIG.11
Shape
108
138/DIG.2
Glass fiber
81
138/DIG.3
Teflon™, kel-f
74
138/DIG.4
Air conditioning
42
138/DIG.5
Pre-stress
28
138/DIG.6
Corrosion
121
138/DIG.7
Resins
166
138/DIG.8
Bent shaped retained
83
138/DIG.9
Cellular
57
Patents under this class:
Patent Number
Title Of Patent
Date Issued
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