US2744534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airline filter and automatic drain valve
Assignee: Norgren LLC
•
Filing: 1952-08-22
•
Granted: 1956-05-08
•
Expires: 1972-08-22
Abstract
No abstract record available.
Inventors
- 👤 Delbert G Faust
- 👤 Jr Jesse A Wilson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:18
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/04; B01D45/08; F; F16; F16T; F16T1/00; F16T1/20; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3021; Y10T137/304; Y10T137/3052; Y10T137/3068; Y10T137/3077
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US624511A
Cited
US969282A
Cited
GB191414797A
Cited
US1784664A
Cited
US1904994A
Cited
US2416855A
Cited
US2510049A
Cited
US2665711A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-08 | 1959-11-07 | 1960-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-08 | 1963-11-07 | 1964-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-08 | 1967-11-07 | 1968-05-08 | $7700.00 | Window Closed / Lapsed |