| Patents for F16L 15 - Screw-threaded joints; Forms of screw-threads for such joints (5,444) |
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| 04/07/1992 | US5101915 Adjustable angle pipe joint |
| 04/07/1992 | US5101906 Horizontal drilling or completion method |
| 03/31/1992 | US5099825 Boiling water units |
| 03/03/1992 | US5092635 Buttress thread form |
| 02/27/1992 | DE4125570A1 Connection of pipe to water tap - involves screwed bush with groove to receive turned over edge of pipe |
| 02/12/1992 | CN2095862U Pipe joint type water magnetizing purifying device |
| 02/05/1992 | EP0468959A1 Packing in the form of a truncated cone for making a watertight seal between threaded connections. |
| 02/05/1992 | CN1015402B Threaded connection joint of a steel tube with sealing unit at the threaded portion |
| 01/28/1992 | US5083890 Threaded coupling of two parts of different hardness |
| 01/28/1992 | US5083821 Extreme temperature thread sealing method and apparatus |
| 01/23/1992 | DE4023264A1 Coupling for two metal pipe sections - consists of threads on two sections, with radial thrust surface, and end |
| 01/08/1992 | CN2092651U Adjustable joint |
| 12/25/1991 | CN1015198B Hermetic metal pipe joint |
| 12/24/1991 | CA1293525C End connectors for filament wound tubes |
| 12/12/1991 | WO1991018733A1 Method of joining threaded non-ferrous pipe sections |
| 12/04/1991 | EP0459957A1 Connector with a seal inserted on the thread of the threaded shank |
| 12/03/1991 | US5069761 Method for pretreating the connecting elements of a gas-tight pipe connection |
| 12/03/1991 | US5069485 Brittle lined pipe connector |
| 12/03/1991 | CA1292758C Cylindrical threaded connection with uniform interference |
| 12/02/1991 | CA2043590A1 Method of joining threaded non-ferrous pipe sections |
| 11/27/1991 | EP0220274B1 Tubular connection having two thread sets with multiple interengaging characteristics |
| 11/26/1991 | CA1292488C Pipe joint |
| 11/26/1991 | CA1292487C Petroleum equipment tubular connection |
| 11/21/1991 | EP0423196A4 Composite thread coupling for reinforced pipe |
| 11/19/1991 | US5066052 Threaded pipe joint having improved seal ring entrapment |
| 11/14/1991 | WO1991016949A1 Adjustable sprinkler head positioning assembly |
| 11/12/1991 | US5064224 Oil field tubular connection |
| 11/12/1991 | US5064004 Drill rod for percussion drilling |
| 11/05/1991 | US5062667 Connection seal |
| 10/30/1991 | EP0454148A2 Pipe joint |
| 10/30/1991 | EP0454147A2 Thread form |
| 10/29/1991 | US5060740 Screw thread coupling |
| 10/28/1991 | CA2041346A1 Pipe joint |
| 10/28/1991 | CA2041345A1 Thread form |
| 10/17/1991 | WO1991016565A1 Pipe joint |
| 10/15/1991 | US5056831 Fitting construction for connection of pipes and pipe assembly |
| 10/08/1991 | CA1290364C Threaded joint having sealing device at threads, for steel pipe |
| 09/25/1991 | EP0448361A1 Improvements in or relating to threaded members |
| 09/24/1991 | CA1289589C Joints for tubular members |
| 09/18/1991 | EP0447346A2 Improvements in threaded couplings between parts of different hardness |
| 09/17/1991 | US5048871 Screwed pipe joint |
| 09/11/1991 | EP0445349A1 Hydraulic sealing device for threaded connections |
| 09/10/1991 | WO1991014073A1 Thread friction locking device |
| 09/10/1991 | CA2081363A1 Thread friction locking device |
| 09/04/1991 | CN1013783B Joining of hollow drill rads |
| 09/03/1991 | US5044676 Tubular threaded connector joint with separate interfering locking profile |
| 09/03/1991 | CA1288453C Pipe connectors |
| 08/27/1991 | CA1288064C Screw thread protection |
| 08/20/1991 | CA1287899C Crankshaft angle sensing system |
| 08/14/1991 | CN1053831A Double wall spiral corrugated plastic pipe |
| 08/07/1991 | CN1013455B Screw-threaded joint for pipes |
| 07/30/1991 | CA1287079C Pipe screwed connection |
| 07/25/1991 | DE4007408C1 Gas-tight pipe connector for oil fields - in which symmetrical PTFE ring is formed between tapered plug and socket that screw together |
| 07/19/1991 | CA2014851A1 Pipe coupling |
| 07/09/1991 | US5029906 Method and apparatus for forming a ventable seal |
| 07/02/1991 | CA1285584C Method and apparatus for forming a ventable seal |
| 06/11/1991 | CA1284806C Steel tubing coupling, as well as device and method for manufacturing same |
| 06/05/1991 | EP0430383A1 Process and apparatus for metallic coating of the threaded ends of connectable plastic pipes. |
| 05/28/1991 | US5018771 Threaded tubular connection |
| 05/28/1991 | US5018555 Pre-press tube |
| 05/28/1991 | CA1284409C Handle socket adapter |
| 05/22/1991 | EP0428341A1 Boiling water units |
| 05/15/1991 | EP0203074B1 Oilwell tubing connection |
| 05/15/1991 | CN2077073U Different diameters moving joint |
| 05/14/1991 | US5015017 Threaded tubular coupling |
| 05/08/1991 | EP0425782A1 Pipe connection for a drill string |
| 05/08/1991 | EP0264446B1 Joint for oil well pipes and method of manufacturing same |
| 04/24/1991 | EP0423196A1 Composite thread coupling for reinforced pipe. |
| 04/16/1991 | US5007665 Coupling for well casings |
| 03/29/1991 | WO1991005198A1 Variable length pipe connector and method of manufacture and use |
| 03/29/1991 | CA2066758A1 Variable length pipe connector and method of manufacture and use |
| 03/26/1991 | US5002318 Variable length pipe connector and method of manufacture and use |
| 03/26/1991 | CA1282091C Seal for threaded pipe connection |
| 03/20/1991 | EP0417879A1 Insulating support for tubing string |
| 03/14/1991 | CA2017097A1 Adjustable connection apparatus |
| 02/27/1991 | EP0414242A1 Pipe joint and pipe with pipe joint |
| 02/27/1991 | CN2072183U Adjustable screw-threaded tube joint |
| 02/25/1991 | CA2023087A1 Pipe joint and pipe with pipe joint |
| 02/21/1991 | WO1991002185A1 Threaded tubular connection |
| 02/20/1991 | CN2071751U Improved lamp tube connector |
| 02/19/1991 | CA1280456C All metal seal for pressure sealing |
| 02/05/1991 | US4989902 Ratcheting and threaded well connector |
| 01/29/1991 | US4988127 Threaded tubing and casing joint |
| 01/15/1991 | US4984829 Screw coupling joint |
| 01/09/1991 | CN2069061U Joint for water pipes |
| 01/07/1991 | CA2015966A1 Casing head connector |
| 01/02/1991 | CN2068632U Movable joint sluice valve and stop valve |
| 12/28/1990 | CA2010533A1 Insulating support for tubing string |
| 12/12/1990 | CN2067346U Z-pipe connecting member |
| 12/04/1990 | US4974882 Oilwell tubing connection |
| 11/13/1990 | US4969671 Gas-tight joint for pipe linings and risers |
| 11/06/1990 | US4968068 Thread coupling for drill string members |
| 11/01/1990 | WO1990012976A1 Packing in the form of a truncated cone for making a watertight seal between threaded connections |
| 10/31/1990 | EP0394300A1 Crankshaft angle sensing system |
| 10/31/1990 | DE3927436A1 Tensile pipe connection for shaft conveyor pipes - includes thread free centring spaces between connecting sleeve and pipe |
| 10/24/1990 | EP0393802A2 Connection element pretreatment process for a gastight pipe connection |
| 10/19/1990 | CA2014764A1 Method for pretreating the connecting elements of a gas-tight pipe connection |
| 10/17/1990 | EP0392964A2 Locking ring for oil well tool |
| 10/16/1990 | US4962784 In a gas flow measuring system |
| 10/16/1990 | US4962579 Torque position make-up of tubular connections |