Premolded pipe flashing compositions
CA 2209983 C · Owner: Bridgestone/Firestone North American Tire, Llc · Inventors: Davis, James A.; Wasitis, William A.; Barham, William F. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A premolded EPDM pipe flashing composition comprises 100 parts by weight of an elastomeric polymer comprising from about 70 to 95 parts by weight of at least one amorphous ethylene-propylene-diene terpolymer and from to about 30 parts by weight of at least one crystalline or semi-crystalline ethylene-propylene-diene terpolymer; from about 35 to 175 parts by weight of a filler selected from the group consisting of reinforcing and non-reinforcing materials and mixtures thereof, per 100 parts of the polymer; from about 30 to 110 parts by weight of a processing material and mixtures thereof per 100 , parts, of the polymer; and from about 0.6 to 7.5 parts by weight of a cure package per, 100 …
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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 July 8, 1997 and granted September 23, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended July 8, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 8, 2019.
- 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.