US3523643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature control system with recycling high limit
Assignee: Robertshaw Controls Co
•
Filing: 1968-01-12
•
Granted: 1970-08-11
•
Expires: 1988-01-12
Abstract
No abstract record available.
Inventors
- 👤 Michael J Caparone
- 👤 William W Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:53
CPC Classifications
F; F23; F23N; F23N5/00; F23N5/02; F23N5/14; F23N5/143
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1951663A
Cited
US2292830A
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US2308555A
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US2328280A
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US2331476A
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US2596290A
Cited
US3236450A
Cited
US3272432A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-10 | 1974-02-09 | 1974-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-10 | 1978-02-09 | 1978-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-10 | 1982-02-09 | 1982-08-11 | $7700.00 | Window Closed / Lapsed |