D21F 1/065
Shock-absorbing devices
Official title: {Shock-absorbing devices}
D21F1/065 (Shock-absorbing devices) appears on 14 US grants and 1 published applications in this corpus.
Search patents in D21F- Granted patents
- 14
- Published applications
- 1
- Assignees
- 11
- Inventors
- 23
- Latest grant
- 12 May 2009
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1981 | 2 | 0 |
| 1982 | 0 | 0 |
| 1983 | 1 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 0 | 0 |
| 1990 | 2 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 2 | 0 |
| 1999 | 1 | 0 |
| 2000 | 0 | 0 |
| 2001 | 0 | 0 |
| 2002 | 0 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 1 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Machine for the production/processing of a material web and damping device12 May 2009US 7,531,064 B2Voith Patent GmbH
- Stock liquor pressure pulsation absorbing apparatus and method7 Dec 1999US 5,997,693 AMitsubishi Heavy Industries, Ltd.
- Process for damping pressure pulsations and apparatus for performing the process28 Jul 1998US 5,785,815 ASulzer-Escher Wyss GmbH
- Apparatus and method for controlling a pressure of a fiber suspension in a headbox or associated fluid conduit19 May 1998US 5,753,081 AVoith Sulzer Paper Technology North America, Inc.
- Method for attenuation of the machine direction pressure pulsations in the headbox in paper and board machines11 Sep 1990US 4,956,050 AVelmet-Ahlstrom Inc.
Most cited
By later US patents
- Three-way valve for an attenuator15US 4,637,434 ABeloit Corporation · 1987
- Extended low frequency range pulsation attenuator9US 4,308,095 ABeloit Corporation · 1981
- Broad-band pulsation attenuator8US 4,262,700 ABeloit Corporation · 1981
- Pressure pulse absorbing device7US 4,407,330 AMitsubishi Jukogyo Kabushiki Kaisha · 1983
- Process for damping pressure pulsations and apparatus for performing the process5US 5,785,815 ASulzer-Escher Wyss GmbH · 1998