US2957680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control system for optional heating and cooling
Assignee: General Controls Co
•
Filing: 1957-03-11
•
Granted: 1960-10-25
•
Expires: 1977-03-11
Abstract
No abstract record available.
Inventors
- 👤 Douglas S Sterner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:54
CPC Classifications
F; F24; F24F; F24F11/00; F24F11/30; F24F11/62; F24F11/70; F24F11/72; F24F11/74; F24F11/76
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1572969A
Cited
US1996907A
Cited
US1997262A
Cited
US2121625A
Cited
US2273381A
Cited
US2547657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |