Patent US3513644A successfully refreshed from Google Patents.
US3513644A
Expired / Lapsed
US
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Air filter
Assignee: Stauffer Chemical Co
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Filing: 1968-09-19
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Granted: 1970-05-26
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Expires: 1988-09-19
Abstract
No abstract record available.
Inventors
- 👤 Edward D Weil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:15
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0027; B01D46/0035; C; C07; C07F; C07F9/00; C07F9/02; C07F9/06; C07F9/08; C07F9/09; C07F9/091
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2178614A
Cited
US2692654A
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US3109816A
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US3221480A
Cited
US3375305A
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US3417164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-05-25 | 1973-11-24 | 1974-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-05-25 | 1977-11-24 | 1978-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-05-25 | 1981-11-24 | 1982-05-26 | $7700.00 | Window Closed / Lapsed |