Monoacetals of aromatic 1,2-diketones
CA 1054159 A · Owner: Ciba-Geigy Ag · Inventors: Brunisholz, Jean; Kirchmayr, Rudolf
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Monoacetals of aromatic diketones in which the acetal group is derived from primary mono- or dialkohols are useful as sensitizers in the photochemical polymerisation or photochemical crosslinking of polymers. They are prepared from the diketones (benzils) by reaction with sulfites. The sulfites and the benzils may be formed immediately before the reaction in the same vessel without isolating these compounds. Most of the benzil monoacetals are new compounds.
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 8, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 8, 1996.
- 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.