US1881776A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling system
Assignee: Perfex Corp
•
Filing: 1928-07-07
•
Granted: 1932-10-11
•
Expires: 1948-07-07
Abstract
No abstract record available.
Inventors
- 👤 Daniel T Macleod
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:45
CPC Classifications
F; F28; F28D; F28D1/00; F28D1/02; F01; F01P; F01P5/00; F01P5/02; Y; Y10; Y10S; Y10S165/00; Y10S165/228; Y10S165/302; Y10S165/316
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) | 1935-10-11 | 1936-04-11 | 1936-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-10-11 | 1940-04-11 | 1940-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-10-11 | 1944-04-11 | 1944-10-11 | $7700.00 | Window Closed / Lapsed |