Photostencils for screenprinting
CA 1330498 C · Owner: Balfour, Ross A. · Inventors: Balfour, Ross A.; Sperry, John A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Photodimerisable polymer compositions are based upon derivatives of polyvinylalcohol and constituents of the formula:, wherein Y = or , m = 0 or 1;, n = 0 or an integer from 1-6; subject to the proviso that when n . 0, then m = 0;, b = H or a tertiary amine methoxy or ethoxy group;, X = O, S or Se or an NR1 or C(R1)2 group wherein R1 5 H or an alkyl, hydroxyalkyl aryl, or aralkyl group, Z = an anion and wherein R2 and R3 are the same or different and each represents H, halogen or an alkyl hydroxyalkyl, aryl, nitro or cyano group or R2 and R3 taken together may form par. of the same aromatic or aliphatic ring system. The preparation and typical uses of the polymer compositions as …
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 July 5, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 5, 2011.
- 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.