Patent US2077589A successfully refreshed from Google Patents.
US2077589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtering apparatus
Assignee: Brassert & Co
•
Filing: 1934-12-05
•
Granted: 1937-04-20
•
Expires: 1954-12-05
Abstract
No abstract record available.
Inventors
- 👤 Jay J Seaver
- 👤 Selwyne P Kinney
- 👤 William M Kirk
- 👤 Charles W Andrews
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:50
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/62; B01D29/66; B01D29/668; B01D29/01; B01D29/50; B01D29/52
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1940-04-19 | 1940-10-19 | 1941-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-04-19 | 1944-10-19 | 1945-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-04-19 | 1948-10-19 | 1949-04-20 | $7700.00 | Window Closed / Lapsed |