US2804827A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable capacity rotary pump
Assignee: Individual
•
Filing: 1953-06-09
•
Granted: 1957-09-03
•
Expires: 1973-06-09
Abstract
No abstract record available.
Inventors
- 👤 Rydberg George Emil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:30
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/18; F04C14/185; F04C2/00; F04C2/02; F04C2/04; F04C2/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1486682A
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US2146037A
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US2426361A
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US2484789A
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US2552860A
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US2565860A
Cited
US2543603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |