US3363572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure pumping device
Assignee: LEO T ERCK
•
Filing: 1965-09-01
•
Granted: 1968-01-16
•
Expires: 1985-09-01
Abstract
No abstract record available.
Inventors
- 👤 Leo T Erck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:26
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/08; F04D13/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1946353A
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US2027783A
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US2335025A
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US2350973A
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US2829597A
Cited
US2787220A
Cited
US2876708A
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US2968256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-01-15 | 1971-07-17 | 1972-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-01-15 | 1975-07-17 | 1976-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-01-15 | 1979-07-17 | 1980-01-16 | $7700.00 | Window Closed / Lapsed |