US1774044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter casing and process of operating the same
Assignee: Individual
•
Filing: 1925-10-28
•
Granted: 1930-08-26
•
Expires: 1945-10-28
Abstract
No abstract record available.
Inventors
- 👤 Ernest J Sweetland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:03
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/073; B01D33/09; B01D33/15; B01D33/21; B01D33/23; B01D33/44; B01D33/46; B01D33/466; B01D33/58; B01D33/60; B01D33/62; B01D33/66; B01D33/663; B01D33/70; B01D33/72; B01D33/80; B01D33/804; B01D33/807; B01D2201/00; B01D2201/28; B01D2201/282; B01D2201/48; B01D35/00; B01D35/30; B01D35/31
Claims Analysis
Total Claims: 0
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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) | 1933-08-25 | 1934-02-24 | 1934-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-08-25 | 1938-02-24 | 1938-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-08-25 | 1942-02-24 | 1942-08-26 | $7700.00 | Window Closed / Lapsed |