Patent US3444791A successfully refreshed from Google Patents.
US3444791A
Expired / Lapsed
US
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Method for making filter cones
Assignee: Individual
•
Filing: 1966-08-10
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Granted: 1969-05-20
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Expires: 1986-08-10
Abstract
No abstract record available.
Inventors
- 👤 Karl-Heinz Honsel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:58
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/06; A47J31/08; B; B31; B31D; B31D1/00; B31D1/0006; Y; Y10; Y10S; Y10S493/00; Y10S493/941; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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Cited
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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) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |