US3431745A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid nitrogen flash freezing
Assignee: Integral Process Systems Inc
•
Filing: 1965-09-15
•
Granted: 1969-03-11
•
Expires: 1985-09-15
Abstract
No abstract record available.
Inventors
- 👤 John D Harper
- 👤 Frederick Breyer
- 👤 Richard C Wagner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:46
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; F25D3/11; F25D2201/00; F25D2201/10; F25D2201/12; F25D2201/126; F25D2201/14
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2898384A
Cited
US3028855A
Cited
US3255608A
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) | 1972-03-10 | 1972-09-09 | 1973-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-03-10 | 1976-09-09 | 1977-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-03-10 | 1980-09-09 | 1981-03-11 | $7700.00 | Window Closed / Lapsed |