Patent US2672673A successfully refreshed from Google Patents.
US2672673A
Expired / Lapsed
US
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Manufacture of fibrous material for filters and the like
Assignee: Individual
•
Filing: 1951-02-10
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Granted: 1954-03-23
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Expires: 1971-02-10
Abstract
No abstract record available.
Inventors
- 👤 Ernest C Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:11
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US742700A
Cited
US1243133A
Cited
US1225671A
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US1332549A
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US1389043A
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US1454049A
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US1529701A
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US1572220A
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US1898027A
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US2173978A
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GB498765A
Cited
US2297440A
Cited
US2391560A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-03-22 | 1957-09-21 | 1958-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-22 | 1961-09-21 | 1962-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-22 | 1965-09-21 | 1966-03-23 | $7700.00 | Window Closed / Lapsed |