Process and apparatus for combined milling and drying
CA 2409422 A1 · Owner: Schlesiger, Hartwig · Inventors: Heidemann, Rudolf; Sonnenberg, Gerd; Schlesiger, Hartwig
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A process of both milling and drying a solvent-moist material (e.g. water-moist methylhydroxyethylcellulose) is described. The process includes (a) providing a mill-dryer (100) which includes in series, a heat exchanger , (1), a mill (2) and a particulate separating apparatus (105) connected by conduits (8), (9) and (11, 12), which together define a mill-dryer circuit (103). The mill-, dryer (100) also includes a bypass conduit (14) which provides optionally at, least partial gaseous bypass of the heat exchanger (1). The process further includes: (b) introducing the solvent-moist material into the mill (2); (c) circulating a vapor stream (e.g. a steam/air stream) throughout the milldryer, …
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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 23, 2002. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 23, 2022.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 23, 2024.
- 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.