Patent US2979634A successfully refreshed from Google Patents.
US2979634A
Expired / Lapsed
US
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Projection lamp
Assignee: GTE Sylvania Inc
•
Filing: 1957-12-09
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Granted: 1961-04-11
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Expires: 1977-12-09
Abstract
No abstract record available.
Inventors
- 👤 Jr Sandford C Peek
- 👤 Broek Jan A Van Den
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:19
CPC Classifications
H; H01; H01K; H01K7/00; H01K7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US654208A
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US1344429A
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US1863547A
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US1635116A
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US1998967A
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US1800926A
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US1835705A
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US1936854A
Cited
US2144438A
Cited
US2795722A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-10 | 1964-10-10 | 1965-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-10 | 1968-10-10 | 1969-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-10 | 1972-10-10 | 1973-04-11 | $7700.00 | Window Closed / Lapsed |