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Patent US2374074A successfully refreshed from Google Patents.
US2374074A
Expired / Lapsed
US
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Rotatable derrick
Assignee: CLYDE IRON WORKS Inc
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Filing: 1943-04-22
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Granted: 1945-04-17
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Expires: 1963-04-22
Abstract
No abstract record available.
Inventors
- 👤 Ola L Berby
- 👤 Robert P Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:38
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/18; B66C23/36; B66C23/52; B66C2700/00; B66C2700/03; B66C2700/0321; B66C2700/0328; B66C2700/0335; B66C2700/0342
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-04-16 | 1948-10-16 | 1949-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-04-16 | 1952-10-16 | 1953-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-04-16 | 1956-10-16 | 1957-04-17 | $7700.00 | Window Closed / Lapsed |