Patent US2550424A successfully refreshed from Google Patents.
US2550424A
Expired / Lapsed
US
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Positive grip lifting tool
Assignee: Individual
•
Filing: 1948-10-19
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Granted: 1951-04-24
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Expires: 1968-10-19
Abstract
No abstract record available.
Inventors
- 👤 Penn W Penn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:25
CPC Classifications
B; B66; B66C; B66C1/00; B66C1/10; B66C1/42; B66C1/44; B66C1/48
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US32210A
Cited
DE210908C
Cited
US901925A
Cited
US1014781A
Cited
US1033531A
Cited
US1516844A
Cited
US1571332A
Cited
US2374120A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-23 | 1954-10-23 | 1955-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-23 | 1958-10-23 | 1959-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-23 | 1962-10-23 | 1963-04-24 | $7700.00 | Window Closed / Lapsed |