Patent US3966906A successfully refreshed from Google Patents.
Patent US2581641A successfully refreshed from Google Patents.
US2581641A
Expired / Lapsed
US
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Assignee: Individual
•
Filing: 1947-03-18
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Granted: 1952-01-08
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Expires: 1967-03-18
Abstract
No abstract record available.
Inventors
- 👤 Forgaard Harcourt Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:22
CPC Classifications
F; F16; F16B; F16B37/00; F16B37/12; F16B37/04; F16B37/06; F16B37/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
US1161317A
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US1179861A
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US1688087A
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GB512740A
Cited
FR877871A
Cited
US2320032A
Cited
US2333388A
Cited
US2379804A
Cited
US2410730A
Cited
US2389377A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-01-07 | 1955-07-09 | 1956-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-01-07 | 1959-07-09 | 1960-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-01-07 | 1963-07-09 | 1964-01-08 | $7700.00 | Window Closed / Lapsed |