Patent US3420183A successfully refreshed from Google Patents.
US3420183A
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US
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Subsurface pump
Assignee: MERIDA L HART
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Filing: 1967-01-13
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Granted: 1969-01-07
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Expires: 1987-01-13
Abstract
No abstract record available.
Inventors
- 👤 Merida L Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:44
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/08; F04B9/10; F04B9/103; F04B9/105; F04B9/1053; F04B47/00; F04B47/06; F04B47/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1643616A
Cited
FR673850A
Cited
US1922264A
Cited
US2277306A
Cited
US2386564A
Cited
US3304870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-07 | 1972-07-08 | 1973-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-07 | 1976-07-08 | 1977-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-07 | 1980-07-08 | 1981-01-07 | $7700.00 | Window Closed / Lapsed |