Patent US2920840A successfully refreshed from Google Patents.
US2920840A
Expired / Lapsed
US
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Let-off apparatus
Assignee: Goodrich Corp
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Filing: 1956-10-10
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Granted: 1960-01-12
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Expires: 1976-10-10
Abstract
No abstract record available.
Inventors
- 👤 Ralph F Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:08
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/001; B65; B65H; B65H59/00; B65H59/02; B65H59/04; B29K; B29K2021/00; B29K2105/00; B29K2105/06; B65H2701/00; B65H2701/30; B65H2701/31
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1031487A
Cited
US1462604A
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US2123936A
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US1946313A
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US2263278A
Cited
US2589366A
Cited
US2419808A
Cited
US2578620A
Cited
US2766945A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |