Patent US2808735A successfully refreshed from Google Patents.
US2808735A
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Automatic counterbalance for well pumping apparatus
Assignee: Individual
•
Filing: 1953-11-19
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Granted: 1957-10-08
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Expires: 1973-11-19
Abstract
No abstract record available.
Inventors
- 👤 Richard B Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:17
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/14; F04B47/145; F04B49/00; F04B49/06; Y; Y10; Y10S; Y10S60/00; Y10S60/911; Y10T; Y10T137/00; Y10T137/8593; Y10T137/87169; Y10T137/87217; Y10T74/00; Y10T74/21; Y10T74/2142; Y10T74/2154
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US851709A
Cited
US1648419A
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US2059366A
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US2196816A
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US2269787A
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US2341864A
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US2378497A
Cited
US2671356A
Cited
US2782863A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |