US1660269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ventilating system for vehicles of the type known as tanks
Assignee: Individual
•
Filing: 1925-10-12
•
Granted: 1928-02-21
•
Expires: 1945-10-12
Abstract
No abstract record available.
Inventors
- 👤 Harry A Knox
- 👤 Bertie F Baker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:09
CPC Classifications
F; F41; F41H; F41H7/00; F41H7/02; B; B60; B60H; B60H1/00; B60H1/00357; B60H1/00414
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) | 1931-02-20 | 1931-08-22 | 1932-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-02-20 | 1935-08-22 | 1936-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-02-20 | 1939-08-22 | 1940-02-21 | $7700.00 | Window Closed / Lapsed |