Patent US2879449A successfully refreshed from Google Patents.
US2879449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lamp construction
Assignee: Duro Test Corp
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Filing: 1956-09-04
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Granted: 1959-03-24
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Expires: 1976-09-04
Abstract
No abstract record available.
Inventors
- 👤 Michel E Macksoud
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:55
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
AN ELECTRIC LAMP OF THE TYPE DESCRIBED COMPRISING AN EVACUATED ENVELOPE HAVING AN INTERIOR FLUORESCENT COATING OVERLYING AND IN DIRECT CONTACT WITH AN ULTRAVIOLET LIGHT REFLECTING COATING ON THE INNER FACE OF THE ENVELOPE CONSISTING OF ONE OF THE GROUP CONSISTING OF TITANIUM DIOXIDE AND MAGNESIUM OXIDE, AN ARC DISCHARGING ULTRAVIOLET LIGHT SOURCE, MEANS FOR SUPPORTING SAID LIGHT SOURCE ON THE AXIS OF SAID ENVELOPE, AN INCANDESCENT FILAMENT MOUNTED ON SAID SUPPORT ADJACENT SAID SOURCE, AND SERIES CONNECTIONS FOR SAID SOURCE AND FILAMENT.
Claim 2
Dependent Claim
83 words
AN ELECTRIC LAMP OF THE TYPE DESCRIBED COMPRISING AN EVACUATED ENVELOPE HAVING AN INTERIOR FLUORESCENT COATING OVERLYING AND IN DIRECT CONTACT WITH AN ULTRAVIOLET LIGHT REFLECTING COATING ON THE INNER FACE OF THE ENVELOPE CONSISTING OF ONE OF THE GROUP CONSISTING OF TITANIUM DIOXIDE AND MAGNESIUM OXIDE, AN ARC DISCHARGING ULTRAVIOLET LIGHT SOURCE, MEANS FOR SUPPORTING SAID LIGHT SOURCE ON THE AXIS OF SAID ENVELOPE, AN INCANDESCENT FILAMENT MOUNTED ON SAID SUPPORT ADJACENT SAID SOURCE, AND SERIES CONNECTIONS FOR SAID SOURCE AND FILAMENT.
References Cited (Backward Citations)
GB494192A
Cited
US2315286A
Cited
US2509071A
Cited
GB603326A
Cited
US2524455A
Cited
US2749461A
Cited
US2785327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |