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![[Search a list of Patent Appplications for class 138]](../as.gif) Class 138 | PIPES AND TUBULAR CONDUITS |
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![[List of Patents for class 138 subclass 26]](../ps.gif) | 26 | WITH PRESSURE COMPENSATORS |
| | 32 | THAWING AND FREEZE PROTECTION |
| | 36 | WITH WEAR INDICATOR |
| | 37 | WITH FLOW REGULATORS AND/OR BAFFLES |
| | 89 | WITH CLOSURES AND PLUGS |
 Inflation stem type |
| | 90 | Test plugs |
| | 91 | Double end |
| | 92 | Lateral opening |
| | 93 | Inflatable |
| | 94 | Laterally insertable |
| | 95 | Return bend type |
| | 96R | END PROTECTORS |
| | 97 | REPAIRING |
| | 100 | BREAKJOINT |
| | 103 | COMBINED |
| | 104 | With indicating means |
| | 105 | With trench |
| | 106 | With external support structure |
| | 108 | With means to support disparate element therein |
| | 109 | With end structure |
| | 110 | With hose protector |
| | 111 | PLURAL DUCT |
| | 112 | With spacer and encircling element |
| | 113 | Surrounding radially spaced duct with axially spaced supports for internal duct |
| | 114 | Coaxial |
| | 115 | Longitudinally extending common wall |
| | 118 | FLEXIBLE |
| | 118.1 | Casing |
| | 119 | With means for facilitating collapse |
| | 120 | Joined sections |
| | 121 | Corrugated |
| | 123 | Braided, interlaced, knitted or woven |
| | 128 | Longitudinally seamed |
| | 129 | Spirally wound material |
| | 137 | Distinct layers |
| | 140 | DISTINCT LAYERS |
| | 141 | Bonded to each other |
| | 145 | Coated |
| | 147 | With mechanical means to hold layers in contact |
| | 148 | Spaced |
| | 149 | With intermediate insulation layer |
| | 150 | With spiral seam |
| | 151 | With longitudinal seam |
| | 153 | Reinforced |
| | 154 | SPIRALLY SEAMED |
| | 155 | JOINED SECTIONS |
| | 156 | LONGITUDINALLY SEAMED |
