US3472220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature control systems using a time delay relay
Assignee: Robertshaw Controls Co
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Filing: 1967-10-25
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Granted: 1969-10-14
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Expires: 1987-10-25
Abstract
No abstract record available.
Inventors
- 👤 James R Willson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:16
CPC Classifications
G; G05; G05D; G05D23/00; G05D23/19; G05D23/1919; F; F23; F23N; F23N5/00; F23N5/20; F23N2225/00; F23N2225/08; F23N2231/00; F23N2231/04; F23N2231/06; F23N2231/12; F23N2233/00; F23N2233/06; F23N5/02; F23N5/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-13 | 1973-04-14 | 1973-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-13 | 1977-04-14 | 1977-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-13 | 1981-04-14 | 1981-10-14 | $7700.00 | Window Closed / Lapsed |