Liquid cryogen freezer and method of operating same
US4739623A · kind A · utility
22Cited by
12References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 11, 1987 |
| Grant date | Apr 26, 1988 |
| Priority date | — |
| Expiry date | Jun 11, 2007 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65G2207/24
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A cabinet freezer efficiently utilizes a liquid cryogen refrigerant in conjunction with a spiral conveyor which conveys a product load through a temperature gradient within the freezer. The freezer has a lower inlet and an upper outlet for the conveyor and food load thereon. The escape of cryogen vapors created in the freezer from the liquid cryogen is controlled such that at least about 80% of the vapors exit through the upper outlet which is at the warmest zone established as a part of the temperature gradient in the freezer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.