US2739792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air conditioning systems using heat exchangers local to the conditioned space
Assignee: York Corp
•
Filing: 1952-11-18
•
Granted: 1956-03-27
•
Expires: 1972-11-18
Abstract
No abstract record available.
Inventors
- 👤 Robert D Blum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:41
CPC Classifications
F; F24; F24F; F24F3/00; F24F3/06; F24F3/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2231826A
Cited
US1597774A
Cited
US1886292A
Cited
US1922220A
Cited
US2212201A
Cited
US2257975A
Cited
US2191519A
Cited
US2193295A
Cited
US2463322A
Cited
US2675998A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-27 | 1959-09-26 | 1960-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-27 | 1963-09-26 | 1964-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-27 | 1967-09-26 | 1968-03-27 | $7700.00 | Window Closed / Lapsed |