US2499731A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: Individual
•
Filing: 1945-01-26
•
Granted: 1950-03-07
•
Expires: 1965-01-26
Abstract
No abstract record available.
Inventors
- 👤 Hollis H Derington
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:42
CPC Classifications
F; F21; F21V; F21V21/00; F21V21/08; G; G09; G09F; G09F13/00; G09F13/04; Y; Y10; Y10S; Y10S362/00; Y10S362/806; Y10S362/81
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1585765A
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US1646190A
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US1700943A
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US1807442A
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US1961186A
Cited
US1915236A
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US2001312A
Cited
US2107641A
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US2086958A
Cited
US2216424A
Cited
US2276776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-06 | 1953-09-05 | 1954-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-06 | 1957-09-05 | 1958-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-06 | 1961-09-05 | 1962-03-07 | $7700.00 | Window Closed / Lapsed |