US2786532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Floating support for well tubings
Assignee: ETHEL CLAIRE CREIGHTON
•
Filing: 1949-05-17
•
Granted: 1957-03-26
•
Expires: 1969-05-17
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Creighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:12
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04; E21B33/0415
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1669898A
Cited
US1853856A
Cited
US1909696A
Cited
US1983854A
Cited
US1913489A
Cited
US2259020A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-03-25 | 1960-09-24 | 1961-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-03-25 | 1964-09-24 | 1965-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-03-25 | 1968-09-24 | 1969-03-26 | $7700.00 | Window Closed / Lapsed |