US3383449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing an endless filter string
Assignee: Individual
•
Filing: 1964-10-01
•
Granted: 1968-05-14
•
Expires: 1984-10-01
Abstract
No abstract record available.
Inventors
- 👤 Muller Paul Adolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:53
CPC Classifications
A; A24; A24D; A24D3/00; A24D3/02; A24D3/0204; Y; Y10; Y10S; Y10S493/00; Y10S493/941
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1550084A
Cited
US1661393A
Cited
US2164702A
Cited
US2628656A
Cited
US3238852A
Cited
US2954036A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-05-14 | 1971-11-13 | 1972-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-14 | 1975-11-13 | 1976-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-14 | 1979-11-13 | 1980-05-14 | $7700.00 | Window Closed / Lapsed |