Patent US2943578A successfully refreshed from Google Patents.
US2943578A
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US
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Pumps of the air displacement type
Assignee: Megator Pumps and Compressors Ltd
•
Filing: 1957-12-10
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Granted: 1960-07-05
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Expires: 1977-12-10
Abstract
No abstract record available.
Inventors
- 👤 Mccombie Frederick Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:33
CPC Classifications
F; F04; F04F; F04F1/00; F04F1/06; G; G01; G01G; G01G17/00; G01G17/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1600504A
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US1932037A
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US2104663A
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US2141427A
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US2385905A
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US2434027A
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US2643616A
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GB665949A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |