Patent US4233536A successfully refreshed from Google Patents.
US4233536A
Expired / Lapsed
US
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Incandescent lamp getter
Assignee: Osram Sylvania Inc
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Filing: 1978-12-18
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Granted: 1980-11-11
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Expires: 1998-12-18
Abstract
Abstract An incandescent lamp comprises a glass envelope having a gas fill, a tungsten filament within the envelope, and getter means comprising carbon and hydrogen disposed within the envelope.
Inventors
- 👤 John F. Waymouth
- 👤 Edmund M. Passmore
- 👤 George L. Duggan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:02
CPC Classifications
H; H01; H01K; H01K1/00; H01K1/52; H01K1/54; H01K1/56
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
106 words
An incandescent lamp comprising a glass envelope having a gas fill, a tungsten filament within the envelope, and getter means disposed within the envelope, said getter means comprising carbon and a gas in elemental form, said gas in elemental form being present in a quantity which enhances the gettering effect of the carbon by reacting therewith to transfer and retain the carbon in a gaseous phase, the quantity of carbon being greater than about 30 parts per million of the weight of the filament, said gas in elemental form being hydrogen and said quantity thereof being greater than 30 parts per million of the filament weight.
Claim 2
Dependent Claim
106 words
An incandescent lamp comprising a glass envelope having a gas fill, a tungsten filament within the envelope, and getter means disposed within the envelope, said getter means comprising carbon and a gas in elemental form, said gas in elemental form being present in a quantity which enhances the gettering effect of the carbon by reacting therewith to transfer and retain the carbon in a gaseous phase, the quantity of carbon being greater than about 30 parts per million of the weight of the filament, said gas in elemental form being hydrogen and said quantity thereof being greater than 30 parts per million of the filament weight.
Claim 3
Dependent Claim
22 words
The lamp of claim 1 wherein at least part of the carbon has been added as a gas in the lamp fill.
Claim 4
Dependent Claim
10 words
The lamp of claim 1 wherein said gas is methane.
References Cited (Backward Citations)
US1566848A
Cited
US1600203A
Cited
US1651387A
Cited
US3418512A
Cited
US4074168A
Cited
US4128783A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-11 | 1984-05-12 | 1984-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-11 | 1988-05-12 | 1988-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-11 | 1992-05-12 | 1992-11-11 | $7700.00 | Window Closed / Lapsed |