Positive photoactive compounds based on 2,6-dinitrobenzyl groups
CA 2195014 C · Owner: Ppg Industries, Inc. · Inventors: Kahle, Charles F. Ii; Mcmurdie, Neil D.; Rardon, Daniel E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is an approach to positive acting photochemistry which yields a substantial improvement in quantum efficiency by the use of photoreactive compounds synthesized from monomers including: where X and Y may be the same or different member selected from the group consisting of: halogen, -OH, -OR, -O-SO2R -SR, and NRR'. R and R' may be, hydrogen or any of a wide variety of organic substituents including , substituted or, unsubstituted alkyl aryl, or aralkyl substitutents. If further reaction to form adducts, or polymers is desired, the R or R' groups may include a reactive group such as a, hydroxyl group. After exposure to radiation such as ultraviolet light the , bond is, …
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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
- Filed June 29, 1995 and granted December 4, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 29, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 29, 2017.
- 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.