US3443365A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Restriction indicator
Assignee: Donaldson Co Inc
•
Filing: 1967-12-06
•
Granted: 1969-05-13
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Expires: 1987-12-06
Abstract
No abstract record available.
Inventors
- 👤 Stuart J Lee
- 👤 Raymond L Schenk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:52
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/0084; B01D46/0086; B01D35/00; B01D35/14; B01D35/143; F; F02; F02M; F02M35/00; F02M35/02; F02M35/08; F02M35/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |