US3524303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter structure and method of making the same
Assignee: Individual
•
Filing: 1968-09-13
•
Granted: 1970-08-18
•
Expires: 1988-09-13
Abstract
No abstract record available.
Inventors
- 👤 Edgar S Stoddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:46
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/10; Y; Y10; Y10S; Y10S55/00; Y10S55/45; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49082; Y10T29/49083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US839797A
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US2658742A
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US2731541A
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US2815427A
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US3085348A
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US3001295A
Cited
US3061942A
Cited
US3102395A
Cited
US3268080A
Cited
US3408794A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |