Process and equipment for careful grinding and simultaneous drying of moist cellulose ether products
CA 2003771 A1 · Owner: Ziegelmayer, Manfred · Inventors: Donges, Reinhard; Welt, Gunther; Sponheimer, Manfred
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Abstract of the disclosure: Process and equipment for careful grinding and simultaneous drying of moist cellulose ether products The present invention relates to a process for careful grinding and simultaneous drying of moist cellulose ether products, wherein, a) a moist cellulose ether is introduced by means of a transport gas into a circular space, b) the moist cellulose ether is impact-communited while being circulated, c) the product is simultaneously friction-comminuted in the direction opposite to that of the impact comminution, d) the peripheral speed of the comminution stages which operate in opposite directions, being regulated to such a value that the resulting grinding energy …
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 November 24, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 24, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 24, 2011.
- 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.