Patent US4445067A successfully refreshed from Google Patents.
US4445067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High pressure metal vapor discharge lamp with radioactive material impregnated in ceramic
Assignee: Toshiba Corp
•
Filing: 1981-05-20
•
Granted: 1984-04-24
•
Expires: 2001-05-20
Abstract
Abstract A high pressure metal vapor discharge lamp including an arc tube having opposed ends at which are provided respective main electrodes and a fill including mercury and a starting gas, a radioactive source material including a radioactive substance having a half-life less than 1×10 4 years sealed in the arc tube, an outer tube enclosing the arc tube and a circuit for starting the arc tube.
Inventors
- 👤 Akihiro Inoue
- 👤 Tadao Kanoh
- 👤 Taketo Kamei
- 👤 Akihiro Kamiya
- 👤 Toshihiko Ishigami
- 👤 Akira Kohno
- 👤 Hiroki Sasaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:18
CPC Classifications
H; H01; H01J; H01J7/00; H01J7/30; H01J7/40; H01J61/00; H01J61/02; H01J61/54; H01J61/548; H01J61/82
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
79 words
A high pressure metal vapor discharge lamp comprising: an arc tube having a pair of main electrodes mounted at opposed ends of the arc tube, said arc tube provided with a fill including mercury and a starting gas; a radioactive source material including a ceramic material impregnated with a radioactive substance having a half-life less than 1×10 4 years sealed in said arc tube; an outer tube enclosing said arc tube; and a circuit for starting said arc tube.
Claim 2
Dependent Claim
79 words
A high pressure metal vapor discharge lamp comprising: an arc tube having a pair of main electrodes mounted at opposed ends of the arc tube, said arc tube provided with a fill including mercury and a starting gas; a radioactive source material including a ceramic material impregnated with a radioactive substance having a half-life less than 1×10 4 years sealed in said arc tube; an outer tube enclosing said arc tube; and a circuit for starting said arc tube.
Claim 3
Dependent Claim
18 words
The high pressure metal vapor discharge lamp of claim 1, wherein said ceramic material comprises: alumina and silica.
References Cited (Backward Citations)
US2222093A
Cited
US2765417A
Cited
US2669609A
Cited
US2525263A
Cited
FR1590980A
Cited
JPS4972971A
Cited
US3928781A
Cited
JPS5166174A
Cited
US4044276A
Cited
US4117370A
Cited
US4277725A
Cited
US4258289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-24 | 1987-10-24 | 1988-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-24 | 1991-10-24 | 1992-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-24 | 1995-10-24 | 1996-04-24 | $7700.00 | Window Closed / Lapsed |