Apparatus for pulping and deinking
CA 2253520 A1 · Owner: Grantz, David C. · Inventors: Grantz, David C.; Fondow, William J.; Seifert, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Apparatus for recycling office waste paper and the like of the type having ink and laser print particles coated thereon. The apparatus (200) includes two screw shafts (212, 214) disposed in substantially parallel relationship within a housing having interconnected side walls (202 204, 206, 208) attached to an , underlying bottom wall (210). Each screw shaft (212 214) includes two , frustoconically-shaped sectors (228 230 and 234, 236, respectively) with , radially extending screw flights (240 242 and 244, 246, respectively) wherein the flights of each screw shaft have opposite pitch to each other. One screw shaft tapers from a large diameter at the ends to a smaller diameter at the …
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 April 28, 1997. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 28, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 28, 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.