US2074965A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter bed cleaning device for sewage clarification tanks
Assignee: Filtration Equipment Corp
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Filing: 1933-09-15
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Granted: 1937-03-23
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Expires: 1953-09-15
Abstract
No abstract record available.
Inventors
- 👤 William C Laughlin
- 👤 Abraham B Asch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:59
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/02; B01D24/20; B01D24/22; B01D24/46; B01D24/4605; B01D24/461; B01D24/4621; B01D24/4631; B01D24/4636
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) | 1940-03-22 | 1940-09-21 | 1941-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-03-22 | 1944-09-21 | 1945-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-03-22 | 1948-09-21 | 1949-03-23 | $7700.00 | Window Closed / Lapsed |