Photoactive compounds for use with narrow wavelength band ultraviolet (uv) curing systems
CA 2255629 A1 · Owner: Jonsson, E. Sonny · Inventors: Pittman, Charles Uriah Jr.; Jonsson, E. Sonny; Bowers, Joseph Stanton Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel substituted diaryl ketones, photopolymerization compositions including the compounds, and methods using the same are disclosed. Polymerization of compositions which include the compounds of the invention may be activated by irradiating the composition with ultraviolet light using conventional techniques and radiation sources to give greatly improved cure speeds. The compounds of the invention also show a significantly elevated level of reactivity at a narrow wavelength band with a peak emission wavelength at or near 308 nm. Because of the increased level of activity the photoinitiator , can be used in considerably lower amounts.
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
- Filed May 19, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 19, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 19, 2019.
- 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.