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Patent US2661231A successfully refreshed from Google Patents.
US2661231A
Expired / Lapsed
US
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Sling
Assignee: Individual
•
Filing: 1948-08-25
•
Granted: 1953-12-01
•
Expires: 1968-08-25
Abstract
No abstract record available.
Inventors
- 👤 Leslie M Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:02
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/12; B66C1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1324952A
Cited
US1619793A
Cited
US2293230A
Cited
US2356147A
Cited
US2463240A
Cited
US2555501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |