Patent US2595106A successfully refreshed from Google Patents.
Patent US2251881A successfully refreshed from Google Patents.
US2251881A
Expired / Lapsed
US
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Zone air conditioning control system
Assignee: Honeywell Inc
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Filing: 1938-06-23
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Granted: 1941-08-05
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Expires: 1958-06-23
Abstract
No abstract record available.
Inventors
- 👤 Ellsworth H Danielson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:18
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/30; F24F11/70; F24F11/80; F24F11/83; F24F11/84
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) | 1944-08-04 | 1945-02-03 | 1945-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-08-04 | 1949-02-03 | 1949-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-08-04 | 1953-02-03 | 1953-08-05 | $7700.00 | Window Closed / Lapsed |