Patent US1979043A successfully refreshed from Google Patents.
Patent US2084772A successfully refreshed from Google Patents.
US2084772A
Expired / Lapsed
US
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Sodium vapor lamp
Assignee: Westinghouse Electric Corp
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Filing: 1933-04-29
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Granted: 1937-06-22
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Expires: 1953-04-29
Abstract
No abstract record available.
Inventors
- 👤 John W Marden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:20
CPC Classifications
H; H01; H01J; H01J61/00; H01J61/70; H01J61/74; B; B42; B42F; B42F13/00; B42F13/16; B42F13/20; B42F13/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-06-21 | 1940-12-21 | 1941-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-06-21 | 1944-12-21 | 1945-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-06-21 | 1948-12-21 | 1949-06-22 | $7700.00 | Window Closed / Lapsed |