Patent US2494529A successfully refreshed from Google Patents.
US2494529A
Expired / Lapsed
US
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Vacuum rupture operated pump
Assignee: Individual
•
Filing: 1945-02-23
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Granted: 1950-01-10
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Expires: 1965-02-23
Abstract
No abstract record available.
Inventors
- 👤 Axel M Wirtanen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:46
CPC Classifications
F; F04; F04B; F04B9/00; F04B9/08; F04B9/12; F04B9/1207; F04B9/1215; F04B45/00; F04B45/04; F04B45/053
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1488171A
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US1500975A
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US1825708A
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US1933043A
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US1923333A
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US2067358A
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US2125463A
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US2142329A
Cited
US2208188A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |