Mineral filled heat seamable roof sheeting
CA 2083101 A1 · Owner: Davis, James A. · Inventors: Valaitis, Joseph K.; Davis, James A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A heat seamable sheet material for roofing prepared from an uncured polymeric composition of matter which comprises 100 parts by weight of a semicrystalline polymer and selected from the group consisting of polyolefins prepared from monomers containing at least 2 carbon atoms; from about 20 to 300 parts by weight of one or more non-black mineral fillers per 100 parts of the polymer; and from about 20 to 150 parts by weight of a processing material per 100 parts of the polymer. The nonblack mineral fillers may include hard clays soft clays, calcined clays, chemically modified clays, mica, talc, alumina trihydrates calcium carbonate, titanium dioxide, amorphous precipitated hydrated silica …
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 17, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 17, 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.