Expired Canadian patentCanada
Recording film and recording method
CA 2061237 C · Owner: Yokota, Nobuyuki · Inventors: Yokota, Nobuyuki; Misuda, Katsutoshi; Hasegawa, Takafumi
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A recording film comprising a transparent substrate a porous alumina hydrate layer formed on the substrate and an opaque porous layer laminated on the alumina hydrate layer.
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 February 14, 1992 and granted January 29, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 14, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 14, 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.
FiledFebruary 14, 1992
GrantedJanuary 29, 2002
Term endedFebruary 14, 2012
Patent numberCA 2061237 C
Classification (IPC)B32B27/14 +2 more
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.