US2380156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling
Assignee: Richfield Oil Corp
•
Filing: 1941-06-10
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Granted: 1945-07-10
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Expires: 1961-06-10
Abstract
No abstract record available.
Inventors
- 👤 William M Dobson
- 👤 Albert L Frye
- 👤 Truman A Griggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:13
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/26
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) | 1948-07-09 | 1949-01-08 | 1949-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-07-09 | 1953-01-08 | 1953-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-07-09 | 1957-01-08 | 1957-07-10 | $7700.00 | Window Closed / Lapsed |