US2079449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling rig attachment
Assignee: RALPH E GILCHRIST
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Filing: 1936-03-28
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Granted: 1937-05-04
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Expires: 1956-03-28
Abstract
No abstract record available.
Inventors
- 👤 Albert A Haldeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:41
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/06
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) | 1940-05-03 | 1940-11-02 | 1941-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-05-03 | 1944-11-02 | 1945-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-05-03 | 1948-11-02 | 1949-05-04 | $7700.00 | Window Closed / Lapsed |