US2945676A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic weight control and compen-sating apparatus for subsurface well bore devices
Assignee: Individual
•
Filing: 1956-11-08
•
Granted: 1960-07-19
•
Expires: 1976-11-08
Abstract
No abstract record available.
Inventors
- 👤 Jr Archer W Kammerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:08
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/08; E21B19/09; E21B29/00; E21B29/12; E21B7/00; E21B7/12; E21B7/128; Y; Y10; Y10S; Y10S60/00; Y10S60/907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
NL77087C
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US2772085A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |