Heat resistant nonwoven fabric and process for producing same
CA 2068735 C · Owner: Hosoyama, Koichi · Inventors: Yoshida, Makoto; Hosoyama, Koichi; Takahashi, Nobuo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat resistant nonwoven fabric comprises 95 to 50% by weight of heat resistant fibers and 5 to 50% by weight of thermoplastic resin, the thermoplastic resin being in the form of pillar-shaped melt-bonding members located between the heat resistant fibers, to thereby bond the heat resistant fibers to each other therethrough has an, excellent heat resistance, formability and concealing effect, and a relatively low density, and is useful as an air filter and a covering sheet for heat resistant shaped articles.
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 August 21, 1991 and granted January 11, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 21, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 21, 2013.
- 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.