US2964194A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter construction
Assignee: Dorr Oliver Inc
•
Filing: 1957-04-17
•
Granted: 1960-12-13
•
Expires: 1977-04-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Edwin L Oliver
- 👤 Richards Dwight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:38
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/15; B01D33/21; B01D33/23
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB190213586A
Cited
US765277A
Cited
US896436A
Cited
FR403107A
Cited
US1091080A
Cited
US1746409A
Cited
US1735007A
Cited
FR869677A
Cited
US2395225A
Cited
US2639251A
Cited
US2799397A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-13 | 1964-06-13 | 1964-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-13 | 1968-06-13 | 1968-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-13 | 1972-06-13 | 1972-12-13 | $7700.00 | Window Closed / Lapsed |