Patent US2181305A successfully refreshed from Google Patents.
US2181305A
Expired / Lapsed
US
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Fluorescent lamp
Assignee: Hygrade Sylvania Corp
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Filing: 1938-12-22
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Granted: 1939-11-28
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Expires: 1958-12-22
Abstract
No abstract record available.
Inventors
- 👤 Henry W Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:56
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/61; C09K11/617; C09K11/63; C09K11/67; C09K11/68; H; H01; H01J; H01J61/00; H01J61/02; H01J61/38; H01J61/42; H01J61/44
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) | 1942-11-27 | 1943-05-29 | 1943-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-27 | 1947-05-29 | 1947-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-27 | 1951-05-29 | 1951-11-28 | $7700.00 | Window Closed / Lapsed |