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US2643772A
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Assignee: Individual
•
Filing: 1948-01-07
•
Granted: 1953-06-30
•
Expires: 1968-01-07
Abstract
No abstract record available.
Inventors
- 👤 Martin Michael James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:39
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D24/00; B01D24/02; B01D24/10; B01D24/14; B01D24/46; B01D24/4626; B01D24/4631; B01D24/4694; B01D29/11; B01D29/13; B01D29/15; B01D29/41; B01D29/44; B01D29/445; B01D29/62; B01D29/66; B01D29/70; B01D33/00; B01D33/06; B01D33/067; B01D33/073; B01D33/27; B01D33/275; B01D33/44; B01D33/48; B01D33/52; B01D2201/00; B01D2201/30; B01D2201/309
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE537088C
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US1163334A
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US2065263A
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US2312999A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-06-29 | 1956-12-29 | 1957-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-06-29 | 1960-12-29 | 1961-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-06-29 | 1964-12-29 | 1965-06-30 | $7700.00 | Window Closed / Lapsed |