US2077974A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning apparatus
Assignee: Individual
•
Filing: 1933-06-02
•
Granted: 1937-04-20
•
Expires: 1953-06-02
Abstract
No abstract record available.
Inventors
- 👤 William W Wishart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:29
CPC Classifications
B; B61; B61D; B61D27/00; B61D27/0072; B61D27/0081; B60; B60L; B60L2200/00; B60L2200/26; B60L2240/00; B60L2240/10; B60L2240/34
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) | 1940-04-19 | 1940-10-19 | 1941-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-04-19 | 1944-10-19 | 1945-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-04-19 | 1948-10-19 | 1949-04-20 | $7700.00 | Window Closed / Lapsed |