Rubber compounding resin
CA 2036483 C · Owner: Specialty Acquisition Sub. Inc. · Inventors: Hood, Richard T.; Lamars, Robert M.; Peterson, Alex,. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An improved vulcanizable rubber composition of the type comprising (I) a rubber component selected from natural rubber, synthetic rubber or combinations thereof and (II) a, methylene donor compound which generates formaldehyde upon heating, and (III) a phenolic novolak resin type methylene acceptor compound is disclosed. The improvement comprises having at least ten mole percent of the phenolic groups of the phenolic novolak resin aralkylated with one or more compounds selected from the group consisting of styrene alpha methyl styrene, beta methyl styrene p-methyl styrene, alpha chloro styrene and vinyl naphthalenes.
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 February 15, 1991 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 15, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 15, 2013.
- 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.