US3429108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic-unloading dust valve for centrifugal air cleaners
Assignee: Donaldson Co Inc
•
Filing: 1967-03-03
•
Granted: 1969-02-25
•
Expires: 1987-03-03
Abstract
No abstract record available.
Inventors
- 👤 Robert E Larson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:14
CPC Classifications
B; B01; B01D; B01D50/00; B01D50/20; B01D46/00; B01D46/24; B01D46/42; B01D46/48; F; F02; F02M; F02M35/00; F02M35/02; F02M35/08; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7879; Y10T137/788; Y10T137/7882; Y10T137/7886
Claims Analysis
Total Claims: 0
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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) | 1972-02-25 | 1972-08-26 | 1973-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-25 | 1976-08-26 | 1977-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-25 | 1980-08-26 | 1981-02-25 | $7700.00 | Window Closed / Lapsed |