Use of polymers as antimisting additives in water-based cooling lubricants
CA 2313574 A1 · Owner: Kupfer, Rainer · Inventors: Heier, Karl Heinz; Kupfer, Rainer
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Use of polymers as antimisting additives in water-based cooling lubricants The invention provides for the use of copolymers containing structural units derived, from the compounds of the formulae 1 and 2 (see formula I), in which, R1 and R2 independently of one another are a terminally unsaturated alkenyl radical having 3 to 5 carbon atoms, R3 and R4 independently of one another are C1-C4 alkyl R5 is H or C1-C4 alkyl, R6 is a branched or unbranched C1-C6 alkylene radical X is an anion, and, Y is an alkali metal or ammonium to prevent misting in water-based cooling lubricants.
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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 July 5, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 5, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 5, 2022.
- 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.