US4727286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric lamp including oxygen getter
Assignee: Osram Sylvania Inc
•
Filing: 1981-11-16
•
Granted: 1988-02-23
•
Expires: 2001-11-16
Abstract
Abstract Electric incandescent lamp employing phosphine (PH 3 ) as the getter.
Inventors
- 👤 James P. Keenan
- 👤 Peter R. Gagnon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:38
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/52; H01K1/54; H01K1/56
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
28 words
An electric incandescent lamp having a closed envelope, said envelope containing a filament mounted therein; and a gaseous oxygen getter within said envelope, said oxygen getter comprising phosphine.
Claim 2
Dependent Claim
28 words
An electric incandescent lamp having a closed envelope, said envelope containing a filament mounted therein; and a gaseous oxygen getter within said envelope, said oxygen getter comprising phosphine.
Claim 3
Dependent Claim
12 words
The lamp of claim 1 wherein said envelope contains a substantial vacuum.
Claim 4
Dependent Claim
14 words
The lamp of claim 1 wherein said envelope includes a substantially inert fill gas.
Claim 5
Dependent Claim
28 words
The lamp of claim 3 wherein said substantially inert fill gas is selected from one or more of the group consisting of nitrogen, neon, argon, krypton and xenon.
Claim 6
Dependent Claim
28 words
The lamp of claims 1, 2, 3 or 4 wherein said envelope contains a sufficient amount of halogen to allow said lamp to function with a tungsten-halogen cycle.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-02-22 | 1991-08-24 | 1992-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-02-22 | 1995-08-24 | 1996-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-02-22 | 1999-08-24 | 2000-02-23 | $7700.00 | Window Closed / Lapsed |