US2472999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable drilling rig
Assignee: GEORGE E FAILING SUPPLY Co
•
Filing: 1945-06-04
•
Granted: 1949-06-14
•
Expires: 1965-06-04
Abstract
No abstract record available.
Inventors
- 👤 Alexander Emmett Lee
- 👤 Braithwaite Albert Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:40
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/02; E21B7/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1479310A
Cited
US1794114A
Cited
US2000975A
Cited
US2215928A
Cited
US2200075A
Cited
US2232995A
Cited
US2283866A
Cited
US2334312A
Cited
US2343517A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-13 | 1952-12-13 | 1953-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-13 | 1956-12-13 | 1957-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-13 | 1960-12-13 | 1961-06-14 | $7700.00 | Window Closed / Lapsed |