Colored polyvinyl butyral interlayer with improved haze properties
CA 2369130 A1 · Owner: E.I. Du Pont De Nemours And Company · Inventors: Phillips, Thomas Richard
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A laminar structure comprised of at least two layers of glass and a sheet of plasticized PVB prepared by providing a color concentrate comprised of solid pigmented chips wherein the chips have a preselected size range to minimize haze in the laminated structure and are dispersed in a low molecular weight polyvinyl butyral resin, said chips comprising from about 10 to 60 weight percent of the color concentrate, depositing said color concentrate on a roughened surface of polyvinyl butyral sheeting as a dried colored coating or directly melt incorporating, and thereafter laminating said sheeting between the surfaces of layers of glass.
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 25, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 25, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 25, 2021.
- 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.