US2684575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Submergible type offshore drilling structure
Assignee: Phillips Petroleum Co
•
Filing: 1950-12-22
•
Granted: 1954-07-27
•
Expires: 1970-12-22
Abstract
No abstract record available.
Inventors
- 👤 Robert C Pryor
- 👤 Glen G Hebard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:15
CPC Classifications
E; E02; E02B; E02B17/00; E02B17/02; E02B17/027; E21; E21B; E21B7/00; E21B7/12; E21B7/136; Y; Y10; Y10T; Y10T24/00; Y10T24/39; Y10T24/3916
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2217879A
Cited
US2480144A
Cited
US2580911A
Cited
US2528089A
Cited
US2482788A
Cited
US2551375A
Cited
US2591599A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-07-26 | 1958-01-25 | 1958-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-07-26 | 1962-01-25 | 1962-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-07-26 | 1966-01-25 | 1966-07-27 | $7700.00 | Window Closed / Lapsed |