US1790205A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air purifier
Assignee: Westinghouse Air Brake Co
•
Filing: 1927-05-09
•
Granted: 1931-01-27
•
Expires: 1947-05-09
Abstract
No abstract record available.
Inventors
- 👤 Clyde C Farmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 04:59
CPC Classifications
B; B60; B60T; B60T17/00; B60T17/002; B60T17/004
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) | 1934-01-26 | 1934-07-28 | 1935-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-01-26 | 1938-07-28 | 1939-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-01-26 | 1942-07-28 | 1943-01-27 | $7700.00 | Window Closed / Lapsed |