Process and apparatus for treating polyvinyl alcohol containing waste liquid
CA 1073597 A · Owner: Sando Iron Works Co. · Inventors: Sando, Yoshikazu; Ishidoshiro, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process and an apparatus for treating waste liquid containing polyvinyl alcohol (hereinafter will be called PVA) wherein the waste liquid which is generated through textile product treating processes such as desizing scouring, etc. is col-, lected in a reaction tank. Reaction is carried out in the tank by adding a PVA binder such as formalin salt cake, soda ash, bo-, rax, etc. with air or steam blown in as required to produce the insoluble solid of PVA. The insoluble solid of PVA is separated from the waste liquid and an apparatus comprising a waste liquid treating reaction tank, a chemical tank an air or steam blowing-, in mechanism a centrifugal separator or a filtrating mechanism with …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted March 11, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 11, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.