Polymer cutting apparatus and method
CA 2390422 A1 · Owner: Fisher, George F. · Inventors: Waggoner, Marion G.; Fisher, George F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A polymer cutter with a rotary cutting head (17) in which the cutting edges (20) are on the circumferential periphery of the head is described. The knife blades (18) on the rotary head have a knife angle (22) (as defined) of about 40~ to about 60~. The apparatus is especially useful for cutting hard and/or brittle thermoplastics and may be used for preparing polymer granules or pellets.
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 8, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 8, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 8, 2022.
- 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.