Manufacturing method of resin granules
CA 2081630 A1 · Owner: Yabuuchi, Naoya · Inventors: Yabuuchi, Naoya; Sato, Haruhiko; Seo, Shinji
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a method of manufacturing resin granules having a grain diameter of 1 - 100 µm and a narrow grain size distribution. The method comprises mixing the following three components: a polyvinyl alcohol, an acqueous solution containing at least one type of water soluble polymer and a granule forming component containing a polymerizing monomer, to obtain fine granules heating the granules to agglomerate and unify the granules and then polymerize them during heating or after formation of the granules. The granules obtained by the method of the present invention as useful as electrostatic recording toners and as diagnostic agent carriers.
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 October 28, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 28, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 28, 2014.
- 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.