Patent US2493478A successfully refreshed from Google Patents.
US2493478A
Expired / Lapsed
US
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Rotary pump
Assignee: PERFECTION Manufacturing CORP
•
Filing: 1948-02-24
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Granted: 1950-01-03
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Expires: 1968-02-24
Abstract
No abstract record available.
Inventors
- 👤 Dinesen Laurits
- 👤 Lawrence J Olson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:04
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/3441; F04C2/3442; F01; F01C; F01C21/00; F01C21/08; F01C21/0809
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR31237E
Cited
US1339723A
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US1369380A
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US1521226A
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US1651336A
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CH147225A
Cited
US2015501A
Cited
US1980404A
Cited
US2301654A
Cited
US2433484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-02 | 1953-07-04 | 1954-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-02 | 1957-07-04 | 1958-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-02 | 1961-07-04 | 1962-01-03 | $7700.00 | Window Closed / Lapsed |