Patent US3013538A successfully refreshed from Google Patents.
US3013538A
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Pumping unit with reversing method
Assignee: M W HYDRAULICS Inc
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Filing: 1958-08-08
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Granted: 1961-12-19
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Expires: 1978-08-08
Abstract
No abstract record available.
Inventors
- 👤 John L Welcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:16
CPC Classifications
F; F04; F04B; F04B47/00; F04B47/02; F04B47/04; F04B9/00; F04B9/08; F04B9/10; F04B9/103; F04B9/107; F04B9/1073
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2726642A
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US2914036A
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US2887093A
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US2914037A
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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) | 1964-12-18 | 1965-06-19 | 1965-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-12-18 | 1969-06-19 | 1969-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-12-18 | 1973-06-19 | 1973-12-19 | $7700.00 | Window Closed / Lapsed |