Hydraulic oil and method for its manufacturing
CA 2248100 C · Owner: Linden, Ari · Inventors: Tonttila, Arto; Tonttila, Mika; Linden, Ari
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The hydraulic oil is based on natural fatty acid esters. The basic material of the hydraulic oil is selected from the following esters of tall oil or their mixtures: ester of a polyhydroxy compound of neopentane such as , trimethylolpropane ester (TMP ester) pentaerythritol ester, trimethylolethane ester, trimethylolbutane ester, neopentyl glycol ester and , poly(ethyleneglycol) ester, and it further contains at least an oxidation inhibitor, a corrosion inhibitor, an antifoam agent and an EP lubricant.
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 12, 1997 and granted November 19, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 12, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 12, 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.