| Patents for F16J 9 - Piston-rings, seats therefor; Ring sealings of similar construction in general (4,592) |
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| 11/28/1991 | WO1991014889A3 Piston and piston sealing ring assemblies |
| 11/27/1991 | CN1056559A Piston assembly |
| 11/12/1991 | US5064359 Annular support for a seal for a tilt piston |
| 11/12/1991 | US5064206 Piston ring |
| 11/06/1991 | EP0455511A2 A piston assembly |
| 11/05/1991 | CA2041269A1 Piston assembly |
| 10/23/1991 | CN2087266U Multi-function rubber ring pump piston |
| 10/17/1991 | DE4011535A1 Piston for IC engine - has several compression ring below which is oil scraper ring with pressure unloading holes leading from its groove to piston interior |
| 10/09/1991 | CN1055220A Sealing elements of stuffing-box for piston rod |
| 10/03/1991 | WO1991014890A1 Stuffing box seal for piston rods |
| 10/03/1991 | WO1991014889A2 Piston and piston sealing ring assemblies |
| 10/01/1991 | US5052698 Two-piece type oil ring assembly |
| 09/25/1991 | CN2085448U Piston-ring made of two materials |
| 09/24/1991 | US5050892 Sealing arrangement for piston in compressor |
| 09/17/1991 | US5049606 Polyaminobismaleimide resin and fluorescein |
| 08/27/1991 | US5042825 Combined oil ring assembly |
| 08/22/1991 | DE4005200A1 Piston ring flank, with good wear resistance - comprises chromium coating applied by packing with spaced rings and protected overflow channels in outer flank |
| 08/13/1991 | US5039116 Composite oil-ring |
| 07/31/1991 | CA2008963A1 Piston ring |
| 07/30/1991 | US5035210 Piston assembly of internal combustion engine |
| 07/19/1991 | WO1991010826A1 Piston ring device for piston reciprocating machines, mainly for internal combustion engines |
| 07/19/1991 | CA2049320A1 Piston ring device for piston reciprocating machines, mainly for internal combustion engines |
| 07/17/1991 | EP0436996A1 Piston Rings |
| 07/11/1991 | DE4042082A1 Sealing ring for inside wall of cylinder - is low friction polymer, e.g. PTFE, filled with fibres disposed circumferentially so as to have same thermal expansion as cylinder itself |
| 07/09/1991 | US5031051 Still/slow circuit for a VCR with two heads |
| 07/09/1991 | US5029880 Pressure sealing device for the gap between two coaxial cylindrical surfaces |
| 07/02/1991 | US5028493 Aluminum alloy locally having a composite portion |
| 07/02/1991 | US5028055 Substantially zero leakage path sealing assembly with additional line to line ring |
| 06/26/1991 | EP0434116A1 A piston and cylinder arrangment, more especially for a reciprocator or a high pressure internal combustion engine |
| 06/13/1991 | DE3940301A1 Piston ring with gas seal - has depressurised underside, with active contact surface and cylindrical surface |
| 06/13/1991 | DE3934795C1 Piston ring and piston groove - has radial passages in piston ring lower flank, unconnected in peripheral direction |
| 06/12/1991 | EP0431325A1 Piston or rod seal |
| 06/03/1991 | CA2031345A1 Piston or rod seal |
| 05/29/1991 | DE3939272A1 Sealing ring for gas ducts - consists of groove on inner duct for insert and sealing surface on outer duct |
| 05/21/1991 | US5016524 Sealing arrangement for a piston in a compressor |
| 05/15/1991 | EP0426920A1 Piston for an internal combustion engine |
| 05/08/1991 | EP0426632A2 Impact motor |
| 05/08/1991 | CN1051227A Aligning and seal ring retracting apparatus for plug type valve |
| 05/07/1991 | CA1283774C Piston ring manufacturing method |
| 05/02/1991 | EP0424372A1 A combination seal for sealing between two machine parts. |
| 04/27/1991 | CA2028608A1 Aligning and seal ring retracting apparatus for plug type valve |
| 04/02/1991 | US5003863 Cylinder-piston unit for displacing a roll at right angles to its longitudinal axis |
| 03/27/1991 | EP0418881A1 Sealing for pistons in axial pistons machines |
| 03/27/1991 | EP0418842A1 Manufacturing procedure for a piston ring |
| 03/26/1991 | US5001965 Piston and piston ring |
| 03/07/1991 | DE3928491A1 Lubrication ring groove in trunk piston of IC engine - prevents radial oil ring movement before engine assembly |
| 03/06/1991 | EP0415475A1 Pistons |
| 03/06/1991 | CN1049707A Piston ring |
| 03/05/1991 | US4997024 Method of making a piston |
| 02/28/1991 | DE3927509A1 Liq. compressed plunger piston - is formed esp. of aluminium and has annular porous reinforcement lining in annular groove |
| 02/13/1991 | CN2071261U 活塞泵 Piston pump |
| 02/07/1991 | DE3924982A1 Piston ring for IC engine - has radial slots in upper surface or is fitted groove with radial slots |
| 02/06/1991 | EP0411913A1 Piston assembly of internal combustion engine |
| 02/06/1991 | EP0411244A1 Wear-resistant coating and method for its preparation |
| 02/06/1991 | CN1049081A Still/slow circuit for vtr with two heads |
| 01/29/1991 | US4987867 Piston for internal combustion engines |
| 01/23/1991 | CN2069935U Air compressor lubricated without oil for automobiles |
| 01/22/1991 | US4986168 Piston and multilayer piston ring set |
| 01/16/1991 | CN1048582A Piston ring assembly for stirling engine |
| 01/10/1991 | DE3920449A1 Self tensioning gas sealing piston ring - has top grooved side, and is able to tilt |
| 01/02/1991 | EP0406123A2 Still/slow circuit for a VCR with two heads |
| 01/02/1991 | EP0404826A1 Differential surface roughness dynamic seals and bearings |
| 01/02/1991 | CN2068621U Reciprocatable dynamic contact sealing ring |
| 12/25/1990 | US4979757 Oil ring assembly |
| 12/20/1990 | DE3930443A1 Piston ring seal - with garter spring and double angled joint |
| 12/19/1990 | EP0403182A2 Article of aluminium alloy locally having a composite portion |
| 12/18/1990 | US4978102 Aligning and seal ring retracting apparatus for plug type valve |
| 12/05/1990 | EP0400334A2 Oilless reciprocating compressor and expansion apparatus |
| 11/27/1990 | US4973068 Differential surface roughness dynamic seals and bearings |
| 11/27/1990 | US4973066 Piston ring |
| 11/27/1990 | US4972764 Combination of sliding members |
| 11/14/1990 | EP0397006A1 Piston ring |
| 11/14/1990 | EP0396775A1 Sealing apparatus |
| 10/30/1990 | US4966068 Split ceramic piston ring arrangement with nested biasing ring |
| 10/25/1990 | DE3918996C1 Oil wiper ring for piston - is mfd. from steel strip with m-shaped cross-section and has parallel profile arms coil spring ring and drainage holes |
| 10/16/1990 | US4962691 Mounting structure of a multiple piston ring |
| 10/16/1990 | CA1275295C Slip joint for formed sheet metal seals |
| 10/10/1990 | CN2063588U High mechanical strength l-shaped sealing ring |
| 10/09/1990 | CA1275013A1 Piston and piston ring |
| 09/26/1990 | CN2062769U Full-sealed piston ring |
| 09/26/1990 | CN1045629A Anti-wedging pressure seal ring apparatus |
| 09/18/1990 | US4957212 Non-circular piston rings |
| 09/04/1990 | US4954058 Method for making composite sintered apex seal material |
| 09/04/1990 | US4953876 Sealing ring structure |
| 08/01/1990 | EP0380302A2 High pressure piston sealing system |
| 08/01/1990 | EP0379536A1 Sealing rings |
| 07/18/1990 | CN1043982A Piston ring having function which is for facilitating supply of lubricating oil into annular groove of piston |
| 07/17/1990 | US4941669 Long carbon fibers in aluminum matrix, multilayer for wear resistance |
| 07/11/1990 | EP0377286A1 Improvements relating to a piston ring |
| 07/11/1990 | CN2059202U Full sealed piston ring |
| 07/03/1990 | US4937937 Method for the manufacture of piston rings |
| 06/26/1990 | US4936912 Sintered apex seal material |
| 06/26/1990 | US4936269 Method and apparatus for reduced oil consumption and oil deterioration in reciprocating engines |
| 06/26/1990 | CA1270721A1 Pressure reducing valve |
| 06/19/1990 | US4934350 Method to prevent piston ring rotation |
| 06/14/1990 | WO1990006459A1 Piston rings |
| 06/13/1990 | DE3938745A1 V=engine with single cylinder block - has pistons with oblique upper faces and piston rings parallel to this face |
| 06/07/1990 | DE3936813C1 IC engine air buffer system - consists of blind bores in area of cylinder swept by piston rings |
| 05/29/1990 | US4928577 Piston and cylinder unit |
| 05/22/1990 | US4926811 Internal combustion engines |