US3004669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter and automatic leaf shut-off therefor
Assignee: PROCESS FILTERS Inc
•
Filing: 1957-06-05
•
Granted: 1961-10-17
•
Expires: 1977-06-05
Abstract
No abstract record available.
Inventors
- 👤 Edward A Ulrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:20
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D29/00; B01D29/11; B01D29/13; B01D29/23; B01D29/39; B01D29/41; B01D29/50; B01D29/56; B01D29/58; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 0
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US2551312A
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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) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |