US2854140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for automatic clearing of filters in use
Assignee: Individual
•
Filing: 1956-10-11
•
Granted: 1958-09-30
•
Expires: 1976-10-11
Abstract
No abstract record available.
Inventors
- 👤 Muller Jacques
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:10
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/12; B01D46/00; B01D46/02; B01D46/04; B01D46/42; B01D46/4272; B01D46/66; B01D46/70; B01D46/79
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) | 1961-09-29 | 1962-03-31 | 1962-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-29 | 1966-03-31 | 1966-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-29 | 1970-03-31 | 1970-09-30 | $7700.00 | Window Closed / Lapsed |