Patent US2420152A successfully refreshed from Google Patents.
US2420152A
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Assignee: NIAGARA SEARCHLIGHT Co IN
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Filing: 1944-04-06
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Granted: 1947-05-06
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Expires: 1964-04-06
Abstract
No abstract record available.
Inventors
- 👤 Lewis G Sherwood
- 👤 Charles E Wohler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:27
CPC Classifications
F; F21; F21L; F21L2/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2249690A
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US2164148A
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US2252088A
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US2231585A
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US2271421A
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US2389591A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-05 | 1950-11-04 | 1951-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-05 | 1954-11-04 | 1955-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-05 | 1958-11-04 | 1959-05-06 | $7700.00 | Window Closed / Lapsed |