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Patent US2441939A successfully refreshed from Google Patents.
US2441939A
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Assignee: Individual
•
Filing: 1939-11-14
•
Granted: 1948-05-18
•
Expires: 1959-11-14
Abstract
No abstract record available.
Inventors
- 👤 Harry J Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:48
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/18; F42C15/188; F42C15/192; F42C15/196; F42C15/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1534011A
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US1550977A
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Cited
US1774043A
Cited
US1865802A
Cited
US2014393A
Cited
US2155100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-18 | 1951-11-17 | 1952-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-18 | 1955-11-17 | 1956-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-18 | 1959-11-17 | 1960-05-18 | $7700.00 | Window Closed / Lapsed |