Porous film
CA 1317710 C · Owner: Kao Corporation · Inventors: Shirai, Hidenori; Kimura, Akio; Kawaguchi, Heihachiro
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A porous film comprises a polyolefin resin a filler, and a polyester obtained from a polybasic acid a polyhydric, alcohol and a monobasic acid having 14 to 22 carbon atoms and/or a monohydric alcohol having 12 to 22 carbon atoms or a polyester obtained from a polybasic acid and a monohydric alcohol, the film being obtained by melting and moulding and then stretching. It has a good permeability to moisture and impermeability to liquid being useful, for a sanitary napkin.
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 May 18, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 18, 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.