US2442234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of and apparatus for filtering materials
Assignee: Individual
•
Filing: 1944-05-11
•
Granted: 1948-05-25
•
Expires: 1964-05-11
Abstract
No abstract record available.
Inventors
- 👤 Russell P Dunmire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:08
CPC Classifications
B; B01; B01D; B01D17/00; B01D17/02; B01D17/0217; B01D17/08; B01D29/00; B01D29/44; B01D29/46; B01D33/00; B01D33/06; B01D33/067; B01D33/073; B01D33/27; B01D33/275; B01D33/44; B01D33/52; B01D33/56; B01D33/70; B01D33/72; B01D33/722; B01D33/74; B01D2201/00; B01D2201/28; B01D2201/287
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US978450A
Cited
GB191202420A
Cited
US1262146A
Cited
US1641485A
Cited
GB298226A
Cited
US1933548A
Cited
US2091536A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-25 | 1951-11-24 | 1952-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-25 | 1955-11-24 | 1956-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-25 | 1959-11-24 | 1960-05-25 | $7700.00 | Window Closed / Lapsed |