F21K 5/023
Ignition devices in photo flash bulbs
Official title: {Ignition devices in photo flash bulbs}
F21K5/023 (Ignition devices in photo flash bulbs) appears on 19 US grants and 0 published applications in this corpus.
Search patents in F21K- Granted patents
- 19
- Published applications
- 0
- Assignees
- 6
- Inventors
- 29
- Latest grant
- 30 Nov 1999
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 7 | 0 |
| 1977 | 1 | 0 |
| 1978 | 3 | 0 |
| 1979 | 1 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 0 | 0 |
| 1985 | 0 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 0 | 0 |
| 1992 | 0 | 0 |
| 1993 | 0 | 0 |
| 1994 | 0 | 0 |
| 1995 | 0 | 0 |
| 1996 | 0 | 0 |
| 1997 | 0 | 0 |
| 1998 | 0 | 0 |
| 1999 | 5 | 0 |
By publication year. Applications have been published since 2001.
Subgroups
Granted patents
Recent patents
- Enclosed frictionally ignited photographic flash lamp30 Nov 1999US 5,993,201 AEastman Kodak Company
- Photoflash unit6 Apr 1999US 5,892,992 AEastman Kodak Company
- Flash lamp array with porous vent16 Feb 1999US 5,871,344 AEastman Kodak Company
- Percussively fired flash lamp array16 Feb 1999US 5,871,345 AEastman Kodak Company
- Flashlamp array venting structure16 Feb 1999US 5,871,346 AEastman Kodak Company
No published applications in this class yet.
Most cited
By later US patents
- Flash lamp unit6US 3,980,421 AU. S. Philips Corporation · 1976
- Selective actuating mechanism for signal device using percussive flashlamps6US 4,070,145 AGTE Sylvania Incorporated · 1978
- Photoflash lamp6US 4,078,881 AGeneral Electric Company · 1978
- Flash lamp signaling circuit employing logic signal activation3US 3,935,514 APolaroid Corporation · 1976
- Percussively ignited photoflash lamp and method of making same3US 4,201,540 AGTE Sylvania Incorporated · 1980