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Class Information
Number: 277/914
Name: Seal for a joint or juncture > Backup seal for failure of primary seal
Description: Sealing means comprising a main and secondary sealing means whereby the secondary sealing means acts as an auxiliary seal upon the breakdown of the main sealing means.










Patents under this class:
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Patent Number Title Of Patent Date Issued
7942425 Plasma resistant seal May. 17, 2011
7874771 Milling spindle of machine tool Jan. 25, 2011
7487848 Multi-seal for top drive shaft Feb. 10, 2009
7354046 Sealing apparatus having sequentially engageable seals Apr. 8, 2008
7237778 Shut off valve assembly about a shaft of a device having an entry into a vessel Jul. 3, 2007
7134668 Differential pumping seal apparatus Nov. 14, 2006
6979002 Sealing apparatus having sequentially engageable seals Dec. 27, 2005
6782592 Method for retrofitting a pressure molding system Aug. 31, 2004
6202668 Valve with fire-resistant seal Mar. 20, 2001
6152454 Sealing device for rotating shaft Nov. 28, 2000
6142773 Enveloping device and vertical heat-treating apparatus for semiconductor process system Nov. 7, 2000
6098990 Sealing device for rotating shaft Aug. 8, 2000
6092809 Secondary seal for a sealing arrangement Jul. 25, 2000
5941530 Unidirectional environment barrier seal for subsea wellhead equipment and valves Aug. 24, 1999
5913523 Transmission leak repair process and plate therefor Jun. 22, 1999
5878858 Rotational control apparatus with selective fluid actuation supply Mar. 9, 1999
5860748 Sealing device for roller bearing Jan. 19, 1999
5820132 Sealing device for rotating shaft Oct. 13, 1998
5755372 Self monitoring oil pump seal May. 26, 1998
5562294 Backup seal for axial face seal Oct. 8, 1996
5487550 Secondary gas/liquid mechanical seal assembly Jan. 30, 1996
5449180 Safety device for primary pump Sep. 12, 1995
5303933 Shut-off seal for a rotatable shaft Apr. 19, 1994
5292137 Rotary shaft sealing method and device Mar. 8, 1994
5267736 Sealing apparatus for rotating shafts, in particular stern tube seal for the propeller shaft of a ship Dec. 7, 1993
5209497 Sealing apparatus for rotating shafts, in particular stern tube seal for the propeller shafts of a ship May. 11, 1993
5171024 Reactor coolant pump shaft seal utilizing shape memory metal Dec. 15, 1992
5129782 Turbo-machine sealing device Jul. 14, 1992
5074568 Shaft seal Dec. 24, 1991
5071139 Pressure activated emergency/temporary seal Dec. 10, 1991
5048981 Modular drop-in sealed bearing assembly for downhole drilling motors Sep. 17, 1991
4900039 Twin face seal Feb. 13, 1990
4865333 Seal protection apparatus Sep. 12, 1989
4817846 Transmission shaft sealing arrangement Apr. 4, 1989
4669735 Fail safe high pressure shaft seal Jun. 2, 1987
4658847 Bimetallic C-ring seal Apr. 21, 1987
4647076 High pressure fluid swivel Mar. 3, 1987
4625977 Convertible, stand-by rotary seal assembly Dec. 2, 1986
4624465 Pneumatic safety seal joint made of elastomer with internal septum Nov. 25, 1986
4570942 Dual diameter valve stem packing Feb. 18, 1986
4568091 Leak repair clamp with flexible lip seals Feb. 4, 1986
4552368 Backup seal with bush in form of radially floating washer Nov. 12, 1985
4548389 Redundant high-pressure seal for fluid spring Oct. 22, 1985
4541638 Emergency shaft seal device by deformation of packing ring Sep. 17, 1985
4474203 Valve with pressure energized back seat sealing means Oct. 2, 1984
4453722 Seal means Jun. 12, 1984
4410186 Sealing system for pressurized flanged joints Oct. 18, 1983
4395048 Pump safety device Jul. 26, 1983
4375291 Back-up mechanical seal Mar. 1, 1983
4273148 Stem seal for a fire safe ball valve Jun. 16, 1981

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