US2552191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air filter
Assignee: RUSSELL MILLER MILLING CO
•
Filing: 1948-07-21
•
Granted: 1951-05-08
•
Expires: 1968-07-21
Abstract
No abstract record available.
Inventors
- 👤 Charles A Lang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:49
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/66; B01D46/70; B01D46/72; B01D46/02; B01D46/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE255876C
Cited
US1321490A
Cited
US1944267A
Cited
US1944268A
Cited
DE709109C
Cited
DE737109C
Cited
US2495635A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |