Patent US2091562A successfully refreshed from Google Patents.
US2091562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning system
Assignee: BF Sturtevant Co
•
Filing: 1935-08-30
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Granted: 1937-08-31
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Expires: 1955-08-30
Abstract
No abstract record available.
Inventors
- 👤 Robert T Palmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:17
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/12; F24F3/14; F24F3/1405; F24F11/00; F24F11/30; F24F11/32; F24F11/38; F24F3/153; F24F2003/144; F24F2003/1446
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) | 1940-08-30 | 1941-03-01 | 1941-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-08-30 | 1945-03-01 | 1945-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-08-30 | 1949-03-01 | 1949-08-31 | $7700.00 | Window Closed / Lapsed |