Light-sensitive mixture and copying material comprising an o-naphthoquinonediazide
CA 1213599 A · Owner: Hoechst Aktiengesellschaft · Inventors: Stahlhofen, Paul
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A light-sensitive mixture comprising a lightsensitive naphthoquinone-diazide-sulfonic acid ester corresponding to the formula. I, wherein D represents a 1,2-naphthoquinone-2-diazide-5sulfonyl or -4-sulfonyl radical; R1, R2 R3, R1', R2', and R3' each represent hydrogen halogen, alkyl groups, having 1 to 4 carbon atoms or radicals of the formula DO and n represents an integer from 2 to 18; not more than three DO radicals in total being present on one benzene ring. The mixture is useful for preparing printing plates or photoresists.
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 November 4, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 4, 2003.
- 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.