Rooftop curable heat seamable roof sheeting and method for covering roofs
CA 2066890 A1 · Owner: Valaitis, Joseph K. · 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 rooftop curable heat seamable sheet material for roofing prepared from an uncured polymeric composition of matter comprises 100 parts by weight ofa semi-crystalline polymer having more than about 2 percent by weight crystallinity 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 a filler selected from the group consisting of reinforcing and non-reinforcing materials and mixtures thereof per 100 parts of polymer; from about 20 to 150 parts by weight of a processing material and mixtures thereof per 100 parts of polymer; and from, about 1.5 to 10 parts by weight of a cure package capable of …
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 April 23, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 23, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 23, 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.