Uniform distribution polycarbonate pellets
CA 2056796 A1 · Owner: Kirk, Richard Odett · Inventors: Kirk, Richard Odett
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Polycarbonate pellets characterized in that (a) the median particle size of said pellets is between 250 and 1,000 microns; (b) the particle size dispersion of said pellets is less than 100 microns; and (c) the skew of the particle distribution is less than 0.25; each as determined according to ASTM Designation D 1921-63. These pellets are further characterized in that (a), when said polycarbonate pellets are agitated on a screen having a mesh opening size of 850 microns and when, those pellets not retained on said 850 micron screen are then agitated on a screen having a mesh opening size of 710 microns, the portion of said pellets which together is retained on one or the other of said …
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 December 2, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 2, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 2, 2013.
- 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.