Oil injection apparatus and method for polymer processing
CA 2249204 C · Owner: Edwards, Daniel C. · Inventors: Edwards, Daniel C.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus are provided for adding controlled and accurate quantities of differing oils, to a polymer processing mixer without substantially contaminating one oil with another. Oils are contained in a plurality of oil supply tanks wherein each tank is fluidly connected to the mixer by an oil supply conduit. The speed of the oil pumped through the conduit is controlled by a variable speed pump motor drive unit. The quantity of oil passing through the conduit is preferably measured by a mass flowmeter and the measurement transmitted to a controller. A multidirectional valve controls the delivery of each oil into the mixer. The controller controls the delivery of oil into the …
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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 17, 1997 and granted May 23, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 17, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 17, 2019.
- 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.