US2431782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid filter valve structure
Assignee: Air Maze Corp
•
Filing: 1945-02-07
•
Granted: 1947-12-02
•
Expires: 1965-02-07
Abstract
No abstract record available.
Inventors
- 👤 George M Walton
- 👤 Henry W Matlock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:15
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/14; B01D27/00; B01D27/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US922657A
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US1058737A
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US1220231A
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US1295006A
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US1407763A
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US1507806A
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US1746274A
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US1720380A
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FR736742A
Cited
GB541588A
Cited
US2331119A
Cited
US2344486A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-12-01 | 1951-06-02 | 1951-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-12-01 | 1955-06-02 | 1955-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-12-01 | 1959-06-02 | 1959-12-02 | $7700.00 | Window Closed / Lapsed |