Lightsafe masking film
CA 1324923 C · Owner: Somar Corporation · Inventors: Shimokawahara, Hisashi; Sano, Shinichi; Maruyama, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract, A lightsafe masking film is disclosed which comprises a transparent substrate, and a transparent lightsafe layer, peelably provided over the surface of the substrate and containing (a) a nitrile rubber, (b) a vinyl chloride/vinylidene chloride copolymer having an average polymerization degree of 300-600 and a weight ratio of the vinyl chloride units to the vinylidene chloride units of 60:40 to 95:5 and (c) a lightsafe, substance, the weight ratio of component (b) to component (a) being in the range of 50:50 to 95:5.
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 December 7, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 7, 2010.
- 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.