US2764244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well tool
Assignee: Individual
•
Filing: 1952-04-14
•
Granted: 1956-09-25
•
Expires: 1972-04-14
Abstract
No abstract record available.
Inventors
- 👤 John S Page
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:54
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/124; E21B33/1243
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1854519A
Cited
US2177601A
Cited
US2235318A
Cited
US2352700A
Cited
US2430623A
Cited
US2611437A
Cited
US2516580A
Cited
US2606618A
Cited
US2649916A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-25 | 1960-03-26 | 1960-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-25 | 1964-03-26 | 1964-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-25 | 1968-03-26 | 1968-09-25 | $7700.00 | Window Closed / Lapsed |