US2184618A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic backwash filter control
Assignee: Individual
•
Filing: 1937-11-15
•
Granted: 1939-12-26
•
Expires: 1957-11-15
Abstract
No abstract record available.
Inventors
- 👤 Joseph P Lawlor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:26
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/48; B01D24/02; B01D24/10; B01D24/12; B01D24/46; B01D24/4631; Y; Y10; Y10T; Y10T137/00; Y10T137/2496; Y10T137/2544; Y10T137/4238; Y10T137/4245; Y10T137/4252
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) | 1942-12-25 | 1943-06-26 | 1943-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-12-25 | 1947-06-26 | 1947-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-12-25 | 1951-06-26 | 1951-12-26 | $7700.00 | Window Closed / Lapsed |