Light sensitive diazo compounds, composition and method of making them
CA 1259623 A · Owner: East Shore Chemical Co. · Inventors: Cohen, Louis C.; Gutsell, Erwin S. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The specification discloses photosensitizers comprising esters of 1-oxo-2-diazo-naphthalene sulfonic acid and 4-benzl-1,2,3-trihydroxoybenzene, photo resists based thereon and methods for making the necessary intermediates and final products. The esters show improved sensitivity to light in the mid UV range.
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 September 19, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 19, 2006.
- 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.