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Class Information
Number: 16/51
Name: Miscellaneous hardware > Checks and closers > Liquid
Description: Devices the checking devices including liquid acting as the checking means.










Sub-classes under this class:

Class Number Class Name Patents
16/52 Concentric spring chamber 57
16/54 Hinge 117
16/56 Multiple piston 24
16/57 Oscillating cylinder 9
16/58 Oscillating piston 80
16/59 Side spring chamber 13
16/61 Spring and flexible link 14
16/62 Spring and gear 56


Patents under this class:
1 2

Patent Number Title Of Patent Date Issued
8677560 Door closer, particularly for glass doors Mar. 25, 2014
8613126 Hydraulic door closure apparatus with boost Dec. 24, 2013
8528169 Patch fitting with auto-return function Sep. 10, 2013
8443487 Door closer with a braking mechanism May. 21, 2013
8240005 Regulating valve of a hydraulic door closer Aug. 14, 2012
8225458 Intelligent door restraint Jul. 24, 2012
8117716 One-way valve and door check apparatus Feb. 21, 2012
7841047 Control valve for door closer Nov. 30, 2010
7464437 Door closer Dec. 16, 2008
7428952 Damper device Sep. 30, 2008
7377500 Shock absorbing device for moving body May. 27, 2008
7356878 Door closer Apr. 15, 2008
7240398 Opening and closing damping apparatus Jul. 10, 2007
7065829 Damper device Jun. 27, 2006
7059454 One-way braking device Jun. 13, 2006
7032985 Heart cam and damper unit and opening/closing controlling device using the same Apr. 25, 2006
6913125 Damper Jul. 5, 2005
6840356 Rotary damper Jan. 11, 2005
6678918 Open-close apparatus Jan. 20, 2004
6625847 Door closers Sep. 30, 2003
6618899 Door closer and method of producing a door closer Sep. 16, 2003
6499185 Apparatus for holding a door open Dec. 31, 2002
6434788 Door closer Aug. 20, 2002
6397430 Adjustable hydraulic backcheck door closer Jun. 4, 2002
6314612 Door hinge with a locking device based on a field force Nov. 13, 2001
6298520 Door closer and mounting bracket Oct. 9, 2001
6240598 Arrangement for controlling an angularly movable member Jun. 5, 2001
6205615 Door closer Mar. 27, 2001
6202253 Storm door cylinder lock Mar. 20, 2001
6154924 Door closer unit Dec. 5, 2000
6125505 Door closer and mounting bracket Oct. 3, 2000
6032330 Locating structure of oil pressure door closer Mar. 7, 2000
5992444 Control device for door closer Nov. 30, 1999
5864920 Door closer for the non-fire side of a fire-door safety installation Feb. 2, 1999
5862896 Device for dampening the movement of a pivotally supported structural part, for example, a flap in an automobile Jan. 26, 1999
5842255 Door closers with automatic latching or/and delayed action Dec. 1, 1998
5836232 Cylinder safety lock Nov. 17, 1998
5666692 Adjustable power closure Sep. 16, 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
5507070 Mechanism for closing a lid Apr. 16, 1996
5477589 Piston-type door closer with adjustable closing speeds Dec. 26, 1995
5468042 Compartment confining construction with an opening, a closure unit for the opening and a positioning unit for the closure unit Nov. 21, 1995
5386614 Door closer Feb. 7, 1995
5343593 Door closer Sep. 6, 1994
5265306 Automatic door closing device Nov. 30, 1993
5259090 Fluid door closer with means to permit entrapped gases to move Nov. 9, 1993
5111548 Liquid check and closer May. 12, 1992
5090089 Automatic door closing device Feb. 25, 1992

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