Oil resistant fluorosilicone heat cured rubber compositions with mixed metal oxides
CA 2092450 A1 · Owner: Wilkens, Diana L. · Inventors: Wilkens, Diana L.; Evans, Edwin R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In one embodiment, the invention comprises a vinyl containing fluorosilicone polymer containing a filler fluorosilicone gum or blend, a filler surface treatment, a cross-linking agent and a heat age additive combined with selected amounts of group (2A) and (2B) metal oxides. In a particular embodiment MgO, and ZnO are present in ratios of about 1:3 - 1:5 and result in improved resilience heat age characteristics and resistance to hot engine oil.
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 March 25, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 25, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 25, 2015.
- 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.