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Class Information
Number: 16/52
Name: Miscellaneous hardware > Checks and closers > Liquid > Concentric spring chamber
Description: Devices in which the spring-chamber is within or concentric with the liquid-chamber.










Sub-classes under this class:

Class Number Class Name Patents
16/53 Cam 35


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8613126 Hydraulic door closure apparatus with boost Dec. 24, 2013
8415902 Door closer with calibration mode Apr. 9, 2013
8240005 Regulating valve of a hydraulic door closer Aug. 14, 2012
8015665 Spring hinge Sep. 13, 2011
7921511 Door closer Apr. 12, 2011
7861371 Door damper Jan. 4, 2011
7815023 Drive device for opening or closing a door or similar Oct. 19, 2010
7774899 Non-handed door closer cover attachment method Aug. 17, 2010
7421761 Door closer Sep. 9, 2008
7240603 Valve Jul. 10, 2007
7007342 Door closer Mar. 7, 2006
6871381 Door closure with adjusting mechanism for controlling door closing speed Mar. 29, 2005
6442795 Damper for a pivot door Sep. 3, 2002
5709009 Door closer for the non-fire side of a fire-door safety installation Jan. 20, 1998
5502874 Speed regulating valve for fluid filled door closers Apr. 2, 1996
5487206 Door control device Jan. 30, 1996
5432977 Door Closers Jul. 18, 1995
5414894 Door closer May. 16, 1995
5343593 Door closer Sep. 6, 1994
5274880 Door closer Jan. 4, 1994
5259090 Fluid door closer with means to permit entrapped gases to move Nov. 9, 1993
5222277 Intermittently and reversibly operable hot wax energized hinge Jun. 29, 1993
5211269 Damper for a flapdoor using viscous fluid May. 18, 1993
5187835 Door closer with rack and pinion, spring, and spring mounting plate Feb. 23, 1993
5170530 Door closer Dec. 15, 1992
5165507 Damper for a flapdoor using viscous fluid Nov. 24, 1992
5111548 Liquid check and closer May. 12, 1992
4844567 Vending machine with controlled return access door Jul. 4, 1989
4835905 Door position indicator for a door closer Jun. 6, 1989
4825503 Braking apparatus for door closer May. 2, 1989
4793023 Door closer and holder Dec. 27, 1988
4723777 Basketball goal and backboard unit Feb. 9, 1988
4697302 Spring operated automatic door and window closing hinge Oct. 6, 1987
4697673 One-way damper Oct. 6, 1987
4669147 Door closer Jun. 2, 1987
4665583 Door closer piston assembly having separate head portions May. 19, 1987
4502180 Door control device having piston assembly with separately formed rack Mar. 5, 1985
4414703 Door closer and holder Nov. 15, 1983
4372005 Operator for sliding doors Feb. 8, 1983
4325164 Offset pivot hinges with door closing devices Apr. 20, 1982
4285094 Door closing apparatus Aug. 25, 1981
4267619 Controlled release door holder May. 19, 1981
4263694 Door closer Apr. 28, 1981
4256293 Throttle control dash pot Mar. 17, 1981
4234996 Automatic door closer constructed for releasably holding a door in a predetermined partly open position Nov. 25, 1980
4194264 Door check device Mar. 25, 1980
4185356 Door closer Jan. 29, 1980
4178655 Counterbalance mechanism Dec. 18, 1979
4097956 Hydraulic door operator with overtravel restraint Jul. 4, 1978
4080687 Door closer Mar. 28, 1978

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