Process for producing crude elastase
CA 1186649 A · Owner: Eisai Co. Ltd. · Inventors: Aoyama, Masahide; Konishi, Masayuki; Yoshizawa, Masayuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process for producing crude elastase from an elastase-containing solution obtained by activation treatment of the pancreas of porcine is provided. The activation is effected by autolysis or by the addition of mammalian duodenum or extract therefrom, trypsin, pancreatin, ethanol acetone, or isopropyl alcohol. The precipitation is effected by adding a water-soluble organic solvent Such as acetone, ethanol or isopropyl alcohol in such an amount that the concentration of the solvent will be in the range of 30 to 80 V/V % based on the solution including the solvent.
Read the whole patent
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 May 7, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 7, 2002.
- 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.