Hydraulic fluid composition for power steering containing a phosphorus compound and a thiadiazole derivative
CA 2009746 C · Owner: Kikuchi, Hiroto · Inventors: Hirose, Yasunori; Kikuchi, Hiroto; Tochigi, Hiroshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydraulic fluid composition for power steering is disclosed, which comprises (a) at least one phosphorus containing compound selected from the group of alkyl, or alkyl substituted or unsubstituted phenyl phosphorus acid compounds, alkyl, or alkyl substituted or unsubstituted phenyl phosphorus thioacid compounds alkyl, or alkyl substituted or unsubstituted phenyl phosphorus dithioacid compounds, and (b) one or more thiadiazole derivatives represented by the formula: where R1 and R2 independently denote a linear or branched alkyl group having 1 to 12 carbons. The composition enables hydraulic systems to be used for longer times without accelerating deterioration of rubber materials employed …
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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 February 9, 1990 and granted January 6, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 9, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 9, 2012.
- 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
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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.