| Patents for F16L 9 - Rigid pipes (18,006) |
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| 06/06/1978 | US4093004 Polyolefins, resistant to penetration by projectiles |
| 05/23/1978 | US4091133 Porous ceramic tubing for flowing gas lasers |
| 05/16/1978 | US4089719 Method and apparatus for feeding reinforcing strand when making a tubular product |
| 04/04/1978 | US4082327 Connecting joint for corrugated plastic tubing |
| 04/04/1978 | US4082120 Method of producing tubular lattice reinforcement for reinforced concrete tubular pipe having a socket at one end thereof |
| 03/21/1978 | US4079747 High temperature valve |
| 03/14/1978 | US4079224 Method for preventing brittle fracture of steel pipe structures |
| 03/07/1978 | US4077828 Machine for manufacturing reinforced tubes |
| 03/07/1978 | US4077577 Non-stressed, high strength, cement-containing pipe and its production |
| 03/07/1978 | US4077434 Sealed lay-in conduit duct |
| 02/21/1978 | US4075376 Boiler tube coating and method for applying the same |
| 02/21/1978 | US4075300 Method for producing cast-in-place pipe employing permanent pipe mold |
| 02/14/1978 | US4073856 Melting, fusion |
| 02/14/1978 | US4073318 Process for wear-resistant ducts |
| 01/31/1978 | US4071599 Tubular member and process of forming a tubular member |
| 01/10/1978 | US4067596 Dual flow passage drill stem |
| 01/10/1978 | US4067362 Reinforced ribbed tubular structure and method of making same |
| 01/03/1978 | US4066987 Electromagnetic waveguides |
| 12/27/1977 | US4065339 Process for producing fibre reinforced plastic tubes with flanges |
| 12/13/1977 | US4062710 Method of covering a pipe, especially a steel pipe, and other metallic articles with thermoplastic synthetic material |
| 11/29/1977 | US4060265 Pipe construction |
| 11/15/1977 | US4058428 Pipe coating machine |
| 10/11/1977 | US4052999 Bumper wall for plasma device |
| 10/04/1977 | US4052498 Guide apparatus for deflecting a linear structure |
| 09/20/1977 | US4049022 Concrete pipes |
| 08/30/1977 | USRE29375 Laminated polymeric articles and process for the production thereof |
| 08/30/1977 | US4044799 Cellular wall hose and method for making same |
| 08/02/1977 | US4039006 Carbon filament wound cylinder and method of producing the same |
| 07/26/1977 | US4037627 Separator for concrete wrapping to submarine pipelines |
| 07/26/1977 | US4037626 High strength composite pipe structure having leakproof joints |
| 07/19/1977 | US4036618 Power transmission line |
| 07/19/1977 | US4036617 Transmission lines |
| 07/05/1977 | US4033808 Apparatus for the production of hollow bodies, especially large-diameter ducts from thermoplastic synthetic resin |
| 07/05/1977 | US4033387 Method of making a reinforcing strip |
| 06/28/1977 | US4031685 Reinforcing cage construction |
| 06/14/1977 | US4028785 Tubular products |
| 06/07/1977 | US4028098 Alloy of manganese, chromium, carbon, silicon, vanadium; transporting liquefied gas |
| 06/07/1977 | US4027488 Shaft liner assembly |
| 05/31/1977 | US4026747 Composite tubing |
| 05/17/1977 | US4023597 Distributors |
| 05/17/1977 | US4023596 Securing means for minimum weight and volume structural supports |
| 05/03/1977 | US4020639 Oval pipe with a flat base |
| 04/19/1977 | US4018250 Modified vinyl ester resin and pipe made therefrom |
| 04/12/1977 | US4017323 Pitch-aluminum pigment composition |
| 04/05/1977 | US4015636 Ceramic refractory covering members |
| 03/29/1977 | US4014370 Outer wrap for pipelines |
| 03/22/1977 | US4013102 Composite tubing |
| 03/08/1977 | US4010775 High temperature valve |
| 03/01/1977 | US4009832 Irrigation means for the uniform distribution of liquid |
| 03/01/1977 | US4009736 Sandwich wall glass fiber reinforced construction and method of making same |
| 02/22/1977 | US4009063 Method of lining a pipe |
| 02/08/1977 | US4006757 Pipe bell end having a thickened portion and apparatus for forming the bell end |
| 01/25/1977 | US4005234 Tubular article and method of making the same |
| 01/18/1977 | US4003173 Wall construction |
| 01/11/1977 | USRE29112 Methods of forming a fiber reinforced pipe on an inflatable mandrel |
| 01/04/1977 | US4001054 Process for making metal pipe |
| 12/28/1976 | US3999483 Removing coatings from pipe |
| 12/21/1976 | US3998579 Device for producing externally ribbed pipes of plastic |
| 12/14/1976 | US3997285 Apparatus for molding an extruded product containing a reinforcing material |
| 11/09/1976 | US3990480 Method and fabric for making reinforcing cages |
| 11/09/1976 | US3990478 Combined strengthening and corrosion protection of pipelines |
| 10/26/1976 | US3987820 Gas riser apparatus and method |
| 10/12/1976 | US3985848 Cutting coatings with jet streams of water while rotating pipe |
| 10/12/1976 | US3985158 Box for mounting diffusers |
| 10/05/1976 | US3983905 Convolutely wound tube having readily conformable edge portions |
| 09/28/1976 | US3982565 Prestressed concrete pipe |
| 09/14/1976 | US3980106 Fluid containing structure |
| 09/14/1976 | US3980105 Laminated article comprising pyrolytic graphite and a composite substrate therefor |
| 08/17/1976 | US3974862 Flexible conduit |
| 08/10/1976 | US3973596 Tubular member and process of forming a tubular member |
| 07/20/1976 | US3970402 Wedge-clamped flange joint |
| 07/20/1976 | US3970335 Dual concentric pipes |
| 07/20/1976 | US3970113 Bimetal multiple cylinder for extruders in plastics processing machinery |
| 07/06/1976 | US3967650 Pipes |
| 06/29/1976 | US3967020 Coated metal pipe |
| 06/22/1976 | US3964873 Furnace |
| 06/15/1976 | US3963844 Extrusion-molded article having good thermal stability |
| 06/15/1976 | US3963056 Concrete piles, poles or the like |
| 06/15/1976 | US3963055 Self-sealing fuel line |
| 06/01/1976 | US3960343 Double wall ducting |
| 05/25/1976 | US3958531 Adjustable endless band doctor |
| 05/11/1976 | US3956051 Apparatus for making fiber reinforced plastic pipe |
| 05/11/1976 | US3955600 Composite pipeline |
| 05/04/1976 | US3954274 Clay tile pipe joint seal containing foamed unsaturated polyester resin |
| 05/04/1976 | US3954133 Spheroidal graphite cast iron pipe of ferritic structure and method of producing the same |
| 04/27/1976 | US3953629 Synthetic concrete laminate |
| 04/20/1976 | US3951439 Modular cellular conduit assembly |
| 04/20/1976 | US3951437 Construction of encased pipelines |
| 04/20/1976 | US3951175 External internal channels in glass tubing |
| 04/20/1976 | US3950839 Method of making an electroforming mandrel |
| 04/13/1976 | US3950465 Centrifugal casting, glass fibers |
| 04/06/1976 | USRE28756 Connecting means for trench cover plates |
| 03/30/1976 | US3946763 Elongate units suitable for use as furnace skids or the like |
| 03/23/1976 | US3945782 Concrete pipes |
| 03/09/1976 | US3943324 Apparatus for forming refractory tubing |
| 03/09/1976 | US3943273 Electrically conducting plastic pipe system |
| 03/02/1976 | US3941296 Process for manufacturing flexible tubing capable of withstanding substantial pressures and flexible metal tubing made thereby |
| 03/02/1976 | US3941160 Interlocking ceramic tile for covering an insulated water cooled pipe structure |
| 03/02/1976 | US3941157 High strength multiple passageway plastic conduit |
| 02/24/1976 | US3939873 Corrosion resistant glass-reinforced plastic pipe liner |