Photoimageable composition having improved photoinitiator system
CA 2266607 C · Owner: Lundy, Daniel E. · Inventors: Kosaka, Eiji; Lundy, Daniel E.; Murakami, Shigeru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention provides a negative-acting photoimageable composition comprising A), between about 30 and about 80 wt% based on total weight of A) plus B) of a binder polymer, having acid functionality sufficient to render said photoimageable composition developable in, alkaline aqueous solution B) between about 20 and about 70 wt% based on total weight of A), plus B) of an addition-polymerizeable non-gaseous .alpha..beta.-, ethylenically unsaturated compound(s) capable of forming a high polymer by free-radical initiated chain-propagating addition, polymerization, at least about 50 mole percent of the .alpha..beta.ethylenically unsaturated moieties of B) being methacrylic moieties, and …
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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 March 19, 1999 and granted February 26, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 19, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 19, 2021.
- 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.