Acoustic insulating panels or elements
CA 2176374 C · Owner: The Dow Chemical Company · Inventors: Deblander, Jean-Philippe Jacques
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention refers to a multilayered insulating panel or element having (a) two outer facings (1), and (b) a soft synthetic foam core material (2) having hollow profiles (3), connected to both outer facings (1). Also disclosed is a multilayered insulating panel or element having (a) two outer facings (1) and (b) soft core material, phases in a spaced relationship between the two outer facings in such a manner that both extremities of the soft core material are contacting the outer facings and having in between such soft core material phases a second core material having a higher density than the soft core material, wherein only one extremity of each second core material phase …
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 November 9, 1994 and granted August 20, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended November 9, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 9, 2016.
- 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.