Top-of-rail lubrication rate control by the hydraulic pulse width modulation method
CA 2653499 C · Owner: Kumar, Sudhir · Inventors: Kumar, Sudhir
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A lubricant system for a railroad locomotive applies a lubricant with great accuracy in computer-controlled precise quantities behind the last axle of the locomotive such that the lubricant is consumed by the time the entire train has passed under all track speed, temperature and train size condition. Hydraulic pulse- width modulation (PWM or %PWM) controls the quantity of lubricant delivered. Time is divided into a series of windows (33 34, 35) each consisting of a few seconds. Lubricant delivered from a pressurized tank (8) through long hoses to a solenoid controlled valve (12) is then metered by the duration within this time window (33 34, 35) for which the computer computes and opens …
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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 March 22, 1999 and granted January 3, 2012. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 22, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 22, 2021.
- 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
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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.