US2503557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Formation tester
Assignee: Individual
•
Filing: 1945-12-22
•
Granted: 1950-04-11
•
Expires: 1965-12-22
Abstract
No abstract record available.
Inventors
- 👤 Boyd R Mckinely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:40
CPC Classifications
E; E21; E21B; E21B49/00; E21B49/08; E21B49/081
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2005955A
Cited
US2189919A
Cited
US2161233A
Cited
US2161135A
Cited
US2197078A
Cited
US2158569A
Cited
US2290441A
Cited
US2341832A
Cited
US2379138A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-04-10 | 1953-10-10 | 1954-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-10 | 1957-10-10 | 1958-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-10 | 1961-10-10 | 1962-04-11 | $7700.00 | Window Closed / Lapsed |