Patent US2691870A successfully refreshed from Google Patents.
US2691870A
Expired / Lapsed
US
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Defrosting means for refrigerating systems
Assignee: C V Hill & Co Inc
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Filing: 1950-09-16
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Granted: 1954-10-19
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Expires: 1970-09-16
Abstract
No abstract record available.
Inventors
- 👤 Victor W Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:03
CPC Classifications
F; F25; F25B; F25B47/00; F25B47/02; F25B47/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2178445A
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US2366635A
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US2500298A
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US2494480A
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US2451682A
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US2524568A
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US2530440A
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US2481469A
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US2522199A
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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) | 1957-10-18 | 1958-04-19 | 1958-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-18 | 1962-04-19 | 1962-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-18 | 1966-04-19 | 1966-10-19 | $7700.00 | Window Closed / Lapsed |