US2173256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for filtering
Assignee: Uniroyal Inc
•
Filing: 1938-10-01
•
Granted: 1939-09-19
•
Expires: 1958-10-01
Abstract
No abstract record available.
Inventors
- 👤 Hubert F Jordan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:21
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/04; B01D33/056; B01D33/44; B01D33/46; B01D33/466; B01D33/48; B01D33/50; B01D33/52; B01D2201/00; B01D2201/18; B01D2201/184
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) | 1942-09-18 | 1943-03-20 | 1943-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-09-18 | 1947-03-20 | 1947-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-09-18 | 1951-03-20 | 1951-09-19 | $7700.00 | Window Closed / Lapsed |