Method for reducing friction between railroad wheel and railway track using metal overbased colloidal disperse systems
CA 2014700 C · Owner: Quinn, Robert E. · Inventors: Quinn, Robert E.; Vinci, James N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for reducing friction between railroad wheel and railway track is disclosed comprising applying to the railway track a composition comprising- an overbased non-Newtonian colloidal disperse system comprising: (1) solid metal-containing colloidal particles pre-dispersed in (2) a disperse medium of at least one inert organic liquid and (3), at least one member selected from the class consisting of organic compounds which are substantially soluble in the disperse medium the molecules, of said organic compound being characterized by polar substituents and hydrophobic portions.
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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 April 17, 1990 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 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
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.