US2547417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostatic control system for furnaces
Assignee: CROWN CONTROLS Co Inc
•
Filing: 1948-03-18
•
Granted: 1951-04-03
•
Expires: 1968-03-18
Abstract
No abstract record available.
Inventors
- 👤 Roland L Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:40
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2092
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US674867A
Cited
US1931464A
Cited
US2166834A
Cited
US2291210A
Cited
US2296704A
Cited
US2300839A
Cited
US2448776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-04-02 | 1954-10-02 | 1955-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-04-02 | 1958-10-02 | 1959-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-04-02 | 1962-10-02 | 1963-04-03 | $7700.00 | Window Closed / Lapsed |