Method of purifying 3-hydroxyalkanoic acid copolymer
CA 2499608 A1 · Owner: Miyamoto, Kenji · Inventors: Matsumoto, Keiji; Ogawa, Noriko; Miyamoto, Kenji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It is intended to provide a method of purifying PHA which is separated from , PHA-containing microbial cells at a high purity without causing a , considerable decrease in its molecular weight. Namely a method of purifying a , 3-hydroxyalkanoic acid copolymer produced by a microorganism wherein a treatment with hydrogen peroxide is carried out while continuously or intermittently adding an alkali to an aqueous suspension containing the 3hydroxyalkanoic acid copolymer separated from the microorganism to thereby control the pH value of the aqueous suspension.
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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
- Filed September 30, 2003. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 30, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 30, 2025.
- 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
Timeline From CIPO dates
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.