US3060732A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Derrick mast with load checking mechanism
Assignee: Individual
•
Filing: 1958-10-03
•
Granted: 1962-10-30
•
Expires: 1978-10-03
Abstract
No abstract record available.
Inventors
- 👤 Stuart E Corry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:57
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/88; B66C23/90
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1183646A
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US1354447A
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US1772188A
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US1828022A
Cited
GB563769A
Cited
US2503698A
Cited
US2487595A
Cited
US2551178A
Cited
US2909367A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |