Process for the preparation of a colored plastic molding material
CA 2020947 A1 · Owner: Busch, Detlef K. · Inventors: Kutzner, Harald; Grohmann, Horst; Busch, Detlef K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Process for the preparation of a colored plastic molding material, The present process is used to continuously monitor the color of the molding material and the test signals are indirectly used to control the mixing ratio of plastic and color pigment. For this purpose, samples are taken continuously from the material flow downstream of the mixer and this close-packed material is fed through the monitoring apparatus past the measuring window. Through the measuring window, the surface of the molding material particles is illuminatec and the reflected light is captured by sensors which allow monitoring of the colors green, blue and red. A computer is used to process the test signals into …
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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 11, 1990. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 11, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 11, 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.