US3427820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryogenic flash freezing machines
Assignee: RELIQUIFIER CORP OF AMERICA
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Filing: 1966-11-14
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Granted: 1969-02-18
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Expires: 1986-11-14
Abstract
No abstract record available.
Inventors
- 👤 James Hart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:13
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F25D3/11; A; A23; A23B; A23B2/00; A23B2/80; A23B2/85; A23B2/88; F25D2400/00; F25D2400/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3090134A
Cited
US3298188A
Cited
US3255608A
Cited
US3315480A
Cited
US3345828A
Cited
US3287932A
Cited
US3277657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-18 | 1972-08-19 | 1973-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-18 | 1976-08-19 | 1977-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-18 | 1980-08-19 | 1981-02-18 | $7700.00 | Window Closed / Lapsed |