Multilayer film exhibiting an opaque appearance
CA 2133447 C · Owner: The Procter & Gamble Company · Inventors: Visscher, Ronald B.; Perry, Bruce F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymeric multilayer film (120) having a high percentage of fillers (126) to increase the opacity of the film is disclosed. The fillers are concentrated in a separate filler-containing layer (124) having about 20 to about 60 weight percent fillers uniformly dispersed therein and about 25 to about 80 percent of the thickness of the total multilayer film. The filler containing layer is coextruded with the outer layer (122) comprising the balance of the thickness of the multilayer film. The multilayer film has at least 15 weight percent fillers.
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 March 22, 1993 and granted July 18, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2015.
- 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.