Solvent free oil soluble drag reducing polymer suspension
CA 2135932 C · Owner: Smith, Ken W. · Inventors: Haynes, Leo V.; Massouda, Debora F.; Smith, Ken W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A hydrocarbon soluble drag reducing suspension is described as well as a process for obtaining the same. Process is directed toward producing a drag reducing product which is easily transportable non-hazardous easily handled and while providing a significant increase in drag reduction capability over existing commercial products. The suspension is preferably substantially solvent-free.
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 27, 1994 and granted May 14, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2016.
- 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.