US2974497A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method of rapid freezing
Assignee: PROCESS EQUIPMENT Co Inc
•
Filing: 1956-07-16
•
Granted: 1961-03-14
•
Expires: 1976-07-16
Abstract
No abstract record available.
Inventors
- 👤 Walter H Carpenter
- 👤 Billy D Hice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:42
CPC Classifications
F; F25; F25D; F25D13/00; F25D13/06; F25D13/062; A; A23; A23B; A23B2/00; A23B2/80; A23B2/803
Claims Analysis
Total Claims: 0
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US2783871A
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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) | 1964-03-13 | 1964-09-12 | 1965-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-13 | 1968-09-12 | 1969-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-13 | 1972-09-12 | 1973-03-14 | $7700.00 | Window Closed / Lapsed |