US2179077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for sinking shafts
Assignee: Phillips Petroleum Co
•
Filing: 1937-12-20
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Granted: 1939-11-07
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Expires: 1957-12-20
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Riney
- 👤 Myron O Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:47
CPC Classifications
E; E21; E21D; E21D1/00; E21D1/10; E21D1/16
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) | 1942-11-06 | 1943-05-08 | 1943-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-11-06 | 1947-05-08 | 1947-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-11-06 | 1951-05-08 | 1951-11-07 | $7700.00 | Window Closed / Lapsed |