US2379848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure filter
Assignee: Butler Manufacturing Co
•
Filing: 1940-04-08
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Granted: 1945-07-03
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Expires: 1960-04-08
Abstract
No abstract record available.
Inventors
- 👤 Walter O Damme
- 👤 Raymond J Gabler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:14
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/39; B01D29/41; B01D29/62; B01D29/66; B01D29/661; B01D29/88; B01D29/94; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1948-07-02 | 1949-01-01 | 1949-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-07-02 | 1953-01-01 | 1953-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-07-02 | 1957-01-01 | 1957-07-03 | $7700.00 | Window Closed / Lapsed |