Method and apparatus for providing sterilized cryogenic liquids
US4620962A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 4, 1985 |
| Grant date | Nov 4, 1986 |
| Priority date | — |
| Expiry date | Mar 4, 2005 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF17C2270/05
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
The invention includes a method and apparatus for providing a sterilized cryogenic liquid. A cryogenic liquid is vaporized, and the resulting gas is sterilized. The sterilized gas is then reliquefied and subcooled. The liquid is vaporized by passing the liquid through a heat exchanger, heat being transferred from the previously sterilized gas to the incoming liquid. Sterilization is accomplished either by passing the gas through a microporous filter, or by subjecting the gas to ultraviolet radiation. The sterilized gas, after passing through the heat exchanger, is directed into a pressurized container, wherein the gas is reliquefied and subcooled. The subcooled liquid is then withdrawn from the apparatus.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.