Patent US1940138A successfully refreshed from Google Patents.
Patent US1944857A successfully refreshed from Google Patents.
US1944857A
Expired / Lapsed
US
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Quick freezing process and refrigerant
Assignee: Standard Oil Co
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Filing: 1931-06-19
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Granted: 1934-01-23
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Expires: 1951-06-19
Abstract
No abstract record available.
Inventors
- 👤 Harold V Atwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:07
CPC Classifications
A; A23; A23B; A23B2/00; A23B2/001; A23B2/80; A23B2/803; A23B2/8033; A23B2/85; A23B2/88; F; F25; F25C; F25C1/00; F25D; F25D9/00; F25D9/005; F25D2400/00; F25D2400/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1937-01-22 | 1937-07-24 | 1938-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1941-01-22 | 1941-07-24 | 1942-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1945-01-22 | 1945-07-24 | 1946-01-23 | $7700.00 | Window Closed / Lapsed |