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Last Updated: November 29, 2021

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Patent: 6,485,649

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Summary for Patent: 6,485,649
Title: Method and device for the production of pure water
Abstract:Input water is preheated in a heat exchanger (2), pumped (4) through another heat exchanger (5) into a heating unit (6). The heating unit heats the water to a temperature of above 100.degree. C., preferably 140-150.degree. C., while maintaining the water in a liquid state without vaporization. A pump (8) feeds the heated water under sufficient pressure to prevent vaporization to at least one crossflow filtration unit (9). A portion of the heated water passes through a thermally stable filtration material having a pore size of 1-20 nanometers for filtering endotoxins and pyrogens, 4-10 nanometers for filtering viruses, or 100 nanometers-30 .mu.m for filtering bacteria. Heated water which has passed through the filtration material is fed through a pure water product outlet of the filtration unit to a pure water outlet (16). A retenate portion of the heated water flows past the filtration material to carry filtered impurities through a retenate output line (10). To conserve energy, the retenate output line passes through the heat exchanger (2) and the pure water product line passes through the heat exchanger (5) to preheat the incoming water. A backflushing valve (7) selectively passes pure water product backward through the filtration material to backflush impurities trapped in the filtration material.
Inventor(s): Terava; Jorma (Lempaala, FI), Nurminen; Teppo (Vantaa, FI)
Assignee: Steris Europe, Inc. (Camberly, GB)
Application Number:09/554,293
Patent Claims:see list of patent claims

Details for Patent 6,485,649

Applicant Tradename Biologic Ingredient Dosage Form BLA Approval Date Patent No. Expiredate
Merck Sharp & Dohme Corp. ZOSTAVAX zoster vaccine live For Injection 125123 2006-05-25 ⤷  Try it Free 2017-11-12
>Applicant >Tradename >Biologic Ingredient >Dosage Form >BLA >Approval Date >Patent No. >Expiredate

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