Lubricant mixtures and grease compositions based thereon
CA 2068860 C · Owner: Harris, John W. · Inventors: Harris, John W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention provides lubricant mixtures for use as base fluid in open-gear grease comprising 10% to 90% w of a liquid polybutene having viscosity at 38°C in the range 1,000 to 20,000 mm2/s and viscosity at 100°C in the range 40 to 500 mm2/s, and 10% to 90% of a liquid polyalphaolefin having viscosity at 38°C in the range 10 to 75 mm2/s and viscosity at 100°C in the range 2 to 15 mm2/s, and open-gear grease compositions containing a major proportion of such lubricant mixtures.
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 May 15, 1992 and granted May 14, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 15, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 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.