Acoustical wall board and wall system
CA 2391601 A1 · Owner: Owens Corning · Inventors: Baumberger, Sean; Alter, Harry A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A composite wallboard (300) (and system when attached to an existing wall) is disclosed. The composite wallboard has a plasterboard layer (308) an , insulation layer (306) and a perforated board layer 302. It is preferred that the perforated board layer be attached to an existing wall (102). The insulation layer attaches the plasterboard layer to the perforated board layer while at the same time decoupling these two. Where the composite wallboard is attached to a typical stud wall, Helmholtz resonators (600) can be defined. This increases the low frequency sound absorption of a wall system (400) that uses the composite wallboard. Installing a wall system that includes the composite …
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 29, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 29, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 29, 2022.
- 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.