US2297828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling
Assignee: Phillips Petroleum Co
•
Filing: 1941-05-12
•
Granted: 1942-10-06
•
Expires: 1961-05-12
Abstract
No abstract record available.
Inventors
- 👤 William R Flatford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:58
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/02; E21B17/028; E21B17/0285; H; H01; H01R; H01R13/00; H01R13/46; H01R13/52; H01R13/523
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) | 1945-10-05 | 1946-04-06 | 1946-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-10-05 | 1950-04-06 | 1950-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-10-05 | 1954-04-06 | 1954-10-06 | $7700.00 | Window Closed / Lapsed |