Sound reduction membrane
CA 1324580 C · Owner: Dear, Terrence Arnold · Inventors: Ingard, Karl Uno; Scheinberg, Stephen Paul; Dear, Terrence Arnold
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
TITLE, Sound Reduction Membrane, ABSTRACT OF THE DISCLOSURE A volumetric sound absorber for audible sound frequencies is made from a thin sheet material that is permeable to air with thickness, mass and flow resistance within specified ranges.
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 November 23, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 23, 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.