Negative-working radiation-sensitive mixture, and radiation-sensitive recording material produced with this mixture
CA 2066147 A1 · Owner: Pawlowski, Georg · Inventors: Spiess, Walter; Eckes, Charlotte; Roeschert, Horst
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A negative-working radiation-sensitive mixture containing, a) a compound which generates a strong acid under the action of actinic radiation, b) a compound having at least two groups crosslinkable by means of acid and, c) a polymeric binder which is insoluble in water and soluble or at least swellable in aqueous alkaline solutions, wherein the compound (a) comprises a ditri- or tetra-, hydroxybenzene which may be further substituted or a, polymer containing a di-, tri-, or tetra- hydroxy phenyl radical, is esterified with respectively 2 3 or 4, sulfonic acids of the formula R-SO3H and is, distinguished by high resolution and high sensitivity over a wide spectral range. It also shows high …
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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 April 15, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 15, 2014.
- 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.