US2703178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well gasing rack
Assignee: Individual
•
Filing: 1950-10-31
•
Granted: 1955-03-01
•
Expires: 1970-10-31
Abstract
No abstract record available.
Inventors
- 👤 David C Corn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:33
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1705237A
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US1750798A
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US1826055A
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US1971609A
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US2086417A
Cited
US2148058A
Cited
US2167584A
Cited
US2172860A
Cited
US2235265A
Cited
US2389045A
Cited
US2488664A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-02-28 | 1958-08-30 | 1959-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-02-28 | 1962-08-30 | 1963-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-02-28 | 1966-08-30 | 1967-03-01 | $7700.00 | Window Closed / Lapsed |