Sulphonic acids and sulphonates
CA 1080745 A · Owner: Exxon Research And Engineering Company · Inventors: Heraud, Jean-Paul; Delbende, Pierre
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Alkaryl sulphonic acids containing at least 1% by weight of an olefin based on the weight of the sulphonic acid. The incorporation of an olefin - and, optionally, water - in the acid alleviates problems of undesirable colour development and also simplifies or eliminates the purification procedures conventionally required for these acids. Thermal stability may also be improved.
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 July 1, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 1, 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
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.