US3461681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refrigeration system defrost control
Assignee: Carrier Corp
•
Filing: 1968-03-11
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Granted: 1969-08-19
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Expires: 1988-03-11
Abstract
No abstract record available.
Inventors
- 👤 Roy F Smith
- 👤 Richard D Kovar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:36
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022; F25B47/025
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) | 1972-08-18 | 1973-02-17 | 1973-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-08-18 | 1977-02-17 | 1977-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-08-18 | 1981-02-17 | 1981-08-19 | $7700.00 | Window Closed / Lapsed |