US2061289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Packer and valve
Assignee: L R KNOWLTON
•
Filing: 1934-10-09
•
Granted: 1936-11-17
•
Expires: 1954-10-09
Abstract
No abstract record available.
Inventors
- 👤 John T Phipps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:31
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/129; E21B33/1294
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1939-11-17 | 1940-05-18 | 1940-11-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-11-17 | 1944-05-18 | 1944-11-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-11-17 | 1948-05-18 | 1948-11-17 | $7700.00 | Window Closed / Lapsed |