US2642997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal machine
Assignee: Individual
•
Filing: 1946-02-14
•
Granted: 1953-06-23
•
Expires: 1966-02-14
Abstract
No abstract record available.
Inventors
- 👤 George W Tompkin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:23
CPC Classifications
B; B04; B04B; B04B13/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1620568A
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FR587634A
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US1921446A
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US2037655A
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US1943098A
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US2056885A
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US2130864A
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US2077053A
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US2119644A
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US2328394A
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US2461764A
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US2467023A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-22 | 1956-12-22 | 1957-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-22 | 1960-12-22 | 1961-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-22 | 1964-12-22 | 1965-06-23 | $7700.00 | Window Closed / Lapsed |