Patent US2289669A successfully refreshed from Google Patents.
US2289669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and apparatus for use in the purification of liquids
Assignee: North American Rayon Corp
•
Filing: 1939-10-17
•
Granted: 1942-07-14
•
Expires: 1959-10-17
Abstract
No abstract record available.
Inventors
- 👤 Maxton Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:11
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/003; B01D21/02; B01D24/00; B01D24/02; B01D24/04; B01D24/46; B01D24/4631; B01D36/00; B01D36/04; B01D2201/00; B01D2201/20; B01D2201/204; B01D2201/206; B01D24/10; B01D24/16; B01D24/165
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) | 1945-07-13 | 1946-01-12 | 1946-07-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-07-13 | 1950-01-12 | 1950-07-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-07-13 | 1954-01-12 | 1954-07-14 | $7700.00 | Window Closed / Lapsed |