Patent US3712701A successfully refreshed from Google Patents.
US3712701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric incandescent lamps
Assignee: British Lighting Industries Ltd
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Filing: 1971-08-27
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Granted: 1973-01-23
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Expires: 1991-08-27
Abstract
Abstract A tungsten-halogen cycle electric incandescent lamp has a fill including a phosphonitrilic halide. Mixtures of more than one of the halides may be employed. The halide can be introduced into the lamp envelope in solution, the solvent being evaporated thereafter to leave the halide as residue.
Inventors
- 👤 R Johnston
- 👤 J Rees
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:53
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/50; Y; Y02; Y02B; Y02B20/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
20 words
A method according to claim 1 in which said solution contains a mixture of (PNBr2)3 and (PNBr2)4 as said halide.
Claim 2
Dependent Claim
21 words
A method according to claim 2 in which said solution contains 0.15 g of said mixture per 100 c.c.s of solution.
Claim 3
Dependent Claim
12 words
A method according to claim 3 in which said solvent is benzene.
Claim 4
Dependent Claim
30 words
A method according to claim 1 in which said solution contains a mixture of (PNC lambda 2)4, (PNC lambda 2)5, (PNC lambda 2)6 and (PNC lambda 2)7 as said halide.
Claim 5
Dependent Claim
21 words
A method according to claim 5 in which said solution contains 0.05 g of said mixture per 100 c.c.s of solution.
Claim 6
Dependent Claim
13 words
A method according to claim 6 in which said solvent is petroleum ether.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-23 | 1976-07-24 | 1977-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-23 | 1980-07-24 | 1981-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-23 | 1984-07-24 | 1985-01-23 | $7700.00 | Window Closed / Lapsed |