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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:
| Patent Number |
Title Of Patent |
Date Issued |
| 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 |
| 4716996 |
Hydraulic rotation damper |
Jan. 5, 1988 |
| 4697302 |
Spring operated automatic door and window closing hinge |
Oct. 6, 1987 |
| 4689849 |
Control mechanism for a door of a motor vehicle with a reciprocating safety valve |
Sep. 1, 1987 |
| 4670939 |
Device for holding a door open with permanent magnet actuated ball valve affecting hydraulic cylinder |
Jun. 9, 1987 |
| 4669147 |
Door closer |
Jun. 2, 1987 |
| 4665583 |
Door closer piston assembly having separate head portions |
May. 19, 1987 |
| 4660250 |
Door closer |
Apr. 28, 1987 |
| 4658468 |
Door check |
Apr. 21, 1987 |
| 4653229 |
Holding installation for double doors |
Mar. 31, 1987 |
| 4580365 |
Automatic door lock |
Apr. 8, 1986 |
| 4527674 |
Shock absorber with a hydro-mechanical stop |
Jul. 9, 1985 |
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