G01R 13/42
Instruments using length of spark discharge
Official title: Instruments using length of spark discharge, e.g. by measuring maximum separation of electrodes to produce spark
G01R13/42 (Instruments using length of spark discharge) appears on 8 US grants and 0 published applications in this corpus.
Search patents in G01R- Granted patents
- 8
- Published applications
- 0
- Assignees
- 5
- Inventors
- 13
- Latest grant
- 31 May 1994
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 2 | 0 |
| 1978 | 2 | 0 |
| 1979 | 1 | 0 |
| 1980 | 0 | 0 |
| 1981 | 0 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 1 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Sparking voltage detecting device for internal combustion engines31 May 1994US 5,317,268 AHonda Giken Kogyo Kabushiki Kaisha
- Transient field indicator25 Apr 1989US 4,825,152 AVoyager Technologies, Inc.
- Spark plug tester29 May 1979US 4,156,839 A
- Method and apparatus for providing output indications in response to the presence of an electromagnetic energy receptor7 Nov 1978US 4,124,846 AELT, Incorporated
- Engine analyzing device14 Mar 1978US 4,079,310 A
No published applications in this class yet.
Most cited
By later US patents
- Capacitor discharge ignition testing apparatus employing visual spark gap indicator188US 3,979,664 ABrunswick Corporation · 1976
- Engine analyzing device10US 4,079,310 A1978
- Transient field indicator10US 4,825,152 AVoyager Technologies, Inc. · 1989
- Ignition arc monitor circuit6US 4,053,823 A1977
- Sparking voltage detecting device for internal combustion engines6US 5,317,268 AHonda Giken Kogyo Kabushiki Kaisha · 1994