US2698140A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating plant control system
Assignee: Individual
•
Filing: 1949-10-14
•
Granted: 1954-12-28
•
Expires: 1969-10-14
Abstract
No abstract record available.
Inventors
- 👤 Randolph J Buechler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:13
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2007
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR822698A
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US2188865A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |