US2271792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Means for treating air
Assignee: MONTGOMERY BROTHERS
•
Filing: 1938-01-19
•
Granted: 1942-02-03
•
Expires: 1958-01-19
Abstract
No abstract record available.
Inventors
- 👤 Alan B Conant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:16
CPC Classifications
A; A61; A61L; A61L9/00; A61L9/16; A61L9/18; A61L9/20; F; F24; F24F; F24F8/00; F24F8/20; F24F8/22
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) | 1945-02-02 | 1945-08-04 | 1946-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-02-02 | 1949-08-04 | 1950-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-02-02 | 1953-08-04 | 1954-02-03 | $7700.00 | Window Closed / Lapsed |