Patent US4476579A successfully refreshed from Google Patents.
Patent US3494551A successfully refreshed from Google Patents.
US3494551A
Expired / Lapsed
US
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Furnace control system
Assignee: Therm O Disc Inc
•
Filing: 1967-11-20
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Granted: 1970-02-10
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Expires: 1987-11-20
Abstract
No abstract record available.
Inventors
- 👤 Harold F Snider
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 21:57
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2064; F24H9/2085; F24H15/00; F24H15/10; F24H15/128; F24H15/156; F24H15/20; F24H15/235; F24H15/25; F24H15/254; F24H15/30; F24H15/345; F24H15/355; F24H15/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |