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Class Information
Number: 16/58
Name: Miscellaneous hardware > Checks and closers > Liquid > Oscillating piston
Description: Devices including cylinders having oscillating pistons.










Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8567011 Door closing mechanism Oct. 29, 2013
8539643 Damped hinge and control device thereof Sep. 24, 2013
8468650 Door closing mechanism Jun. 25, 2013
8317277 Dampened assisted-motion systems and methods Nov. 27, 2012
8056183 Multiple position ball stud for closure strut Nov. 15, 2011
8015665 Spring hinge Sep. 13, 2011
7921511 Door closer Apr. 12, 2011
7861371 Door damper Jan. 4, 2011
7841047 Control valve for door closer Nov. 30, 2010
7815023 Drive device for opening or closing a door or similar Oct. 19, 2010
7814618 Furniture hinge Oct. 19, 2010
7421761 Door closer Sep. 9, 2008
7024725 Overhead door closer with slide arm assembly Apr. 11, 2006
7003847 Door closer Feb. 28, 2006
6871381 Door closure with adjusting mechanism for controlling door closing speed Mar. 29, 2005
6493904 Door closer Dec. 17, 2002
6434788 Door closer Aug. 20, 2002
6397430 Adjustable hydraulic backcheck door closer Jun. 4, 2002
6317922 Door closer Nov. 20, 2001
6260236 Door closer with hydraulic back checking Jul. 17, 2001
6151753 Door closer to generate a sudden change in the transmission ratio during the closing phase Nov. 28, 2000
6112368 Temperature compensating valve Sep. 5, 2000
5687451 Revolving door device Nov. 18, 1997
5657511 Piston-tpye door closer with adjustable closing speeds Aug. 19, 1997
5651162 Hydraulic door control system Jul. 29, 1997
5586361 Door stop, in particular for motor vehicle doors Dec. 24, 1996
5410777 Automatic checking mechanism May. 2, 1995
5251400 Control for a door closer having a power-assist opening feature Oct. 12, 1993
5239778 Modular door control apparatus with quick release connection Aug. 31, 1993
5206971 Apparatus and method for increasing the efficiency of a door closer by reducing friction therein May. 4, 1993
5187835 Door closer with rack and pinion, spring, and spring mounting plate Feb. 23, 1993
5090089 Automatic door closing device Feb. 25, 1992
5064033 Rotary damper Nov. 12, 1991
5050268 Door closer with back checking means Sep. 24, 1991
5016317 Lightly-operating automatic door closer with double cylinders May. 21, 1991
5012551 Furniture hinge May. 7, 1991
4999872 Door closer Mar. 19, 1991
4995194 Power-assist door closer Feb. 26, 1991
4991255 Pneumatic door-closer usable for left-hinged and right-hinged doors Feb. 12, 1991
4967444 Device for damping the closing movement of a dual door spring-loaded or closure and closure control therefor Nov. 6, 1990
4937913 Door closer Jul. 3, 1990
4886149 Rotary type hydraulic damper Dec. 12, 1989
4847946 Hydraulic door closer Jul. 18, 1989
4835905 Door position indicator for a door closer Jun. 6, 1989
4817238 Pneumatic door-closer having a closable passage and a regulatable passage Apr. 4, 1989
4797971 Adjusting device for a vehicle door Jan. 17, 1989
4793023 Door closer and holder Dec. 27, 1988
4785493 Door check Nov. 22, 1988
4773125 Door closer Sep. 27, 1988
4763385 Door closure transmission utilizing an eccentric pinion Aug. 16, 1988

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