Sound absorbent building material
CA 2072214 A1 · Owner: Hunter Douglas International N.V. · Inventors: Rijnders, Willem
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Sound absorbent building panel or strip material comprises a substantially rigid panel body (1) having a plurality of apertures (3) therein and a relatively thin layer of porous fabric (2) being applied to said rigid panel body in such a manner that it covers the apertures (3) therein, said porous fabric having a density defining pores that are substantially smaller than at least some of the apertures in said panel, the fabric layer (2) being bonded to the panel body (1) by means of adhesive material applied, in an open convoluting pattern along multiple adjacently spaced longitudinal tracks (4).
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 June 24, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 24, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2014.
- 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.