Improved pressure sensitive bituminous compositions
CA 2078244 C · Owner: Tamko Asphalt Products, Inc. · Inventors: Mitchell, Grant D.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pressure sensitive bituminous composition having improved tack and adhesiveness, comprising: (1) from about 50 to about 87% of a bituminous component; from about 1 to about 15% of a thermoplastic block copolymer M1, of the A-B-A type, preferably styrene-butadienestyrene; (3) from about 1 to about 10% of a block copolymer, M2, of the A-B type, preferably styrenebutadiene; and (4) from about 5 to about 50% of a fumed silica. The fumed silica is an active ingredient which absorbs excess oil and improves the tack and adhesiveness of the final composition.
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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 September 15, 1992 and granted January 21, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 15, 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.