Process for obtaining high-purity bisphenol a
CA 1311499 C · Owner: Iimuro, Shigeru · Inventors: Kitamura, Takashi; Iimuro, Shigeru; Morimoto, Yoshio
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
There is provided a process for obtaining high-purity bisphenol A by removing most part of phenol from an adduct of bisphenol A with phenol and removing continuously the residual phenol by steam stripping, wherein a multi-tubular packed column is used as a stripping equipment. According to the process of the present invention, the residual phenol in bisphenol A can be removed constantly. In addition the, process of the present invention is economical because the residual phenol can be removed with a small amount of steam.
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 December 15, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 15, 2009.
- 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.