H01H 2009/0055
Oil filters for tap change devices
Official title: {Oil filters for tap change devices}
H01H2009/0055 (Oil filters for tap change devices) appears on 11 US grants and 1 published applications in this corpus.
Search patents in H01H- Granted patents
- 11
- Published applications
- 1
- Assignees
- 6
- Inventors
- 15
- Latest grant
- 16 Oct 2018
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1978 | 1 | 0 |
| 1979 | 0 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 1 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 2 | 0 |
| 1998 | 1 | 0 |
| 1999 | 1 | 0 |
| 2000 | 1 | 0 |
| 2001 | 1 | 0 |
| 2002 | 1 | 0 |
| 2003 | 0 | 0 |
| 2004 | 0 | 0 |
| 2005 | 0 | 0 |
| 2006 | 0 | 0 |
| 2007 | 0 | 0 |
| 2008 | 0 | 0 |
| 2009 | 0 | 0 |
| 2010 | 0 | 0 |
| 2011 | 0 | 0 |
| 2012 | 0 | 0 |
| 2013 | 0 | 0 |
| 2014 | 0 | 0 |
| 2015 | 0 | 0 |
| 2016 | 0 | 1 |
| 2017 | 0 | 0 |
| 2018 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- On-load tap changer16 Oct 2018US 10,102,990 B2Maschinenfabrik Reinhausen GmbH
- Insulating oil leak containment5 Nov 2002US 6,476,723 B1Filmax, Inc.
- Oil-filter assembly9 Oct 2001US 6,299,762 B1Maschinenfabrik Reinhausen GmbH
- Temperature monitor for electrical switchgear18 Apr 2000US 6,052,060 AFilmax, Inc.
- Dehydrating breather apparatus11 May 1999US 5,902,381 AGeneral Signal Corporation
Most cited
By later US patents
- Apparatus for continually upgrading transformer dielectric liquid46US 4,437,082 AWestinghouse Electric Corp. · 1984
- Dehydrating breather apparatus23US 5,902,381 AGeneral Signal Corporation · 1999
- Electrical inductive apparatus18US 4,124,834 AWestinghouse Electric Corp. · 1978
- Transformer leak alarm10US 5,691,706 AFilmax, Inc. · 1997
- Temperature monitor for electrical switchgear9US 6,052,060 AFilmax, Inc. · 2000