Patent US2722893A successfully refreshed from Google Patents.
US2722893A
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US
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Collapsible chamber pump
Assignee: Individual
•
Filing: 1951-01-05
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Granted: 1955-11-08
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Expires: 1971-01-05
Abstract
No abstract record available.
Inventors
- 👤 Maillot Leon Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:40
CPC Classifications
F; F04; F04B; F04B43/00; F04B43/12; F04B43/1253; F04B43/1269; F04B43/02; F04B43/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US34190A
Cited
DE546884C
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US1874667A
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US1922196A
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US2341257A
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US2447265A
Cited
US2412397A
Cited
FR909631A
Cited
US2435902A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-11-07 | 1959-05-09 | 1959-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-11-07 | 1963-05-09 | 1963-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-11-07 | 1967-05-09 | 1967-11-08 | $7700.00 | Window Closed / Lapsed |