Patent US2762310A successfully refreshed from Google Patents.
US2762310A
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Expansible plunger for free piston pumping apparatus
Assignee: National Supply Co
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Filing: 1953-01-05
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Granted: 1956-09-11
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Expires: 1973-01-05
Abstract
No abstract record available.
Inventors
- 👤 Stone E Eklund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:35
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/02; E21B37/04; F; F04; F04B; F04B47/00; F04B47/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1846000A
Cited
US2001012A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-09-11 | 1960-03-12 | 1960-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-11 | 1964-03-12 | 1964-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-11 | 1968-03-12 | 1968-09-11 | $7700.00 | Window Closed / Lapsed |