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US2647633A
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Assignee: DOROTHEA R GREENE
•
Filing: 1948-05-06
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Granted: 1953-08-04
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Expires: 1968-05-06
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:40
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/02; B01D27/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1201302A
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US1698600A
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US1727554A
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US1730581A
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US2014445A
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US2073442A
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US2051126A
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US2388668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |