Process for the spray-drying of useful materials and mixtures thereof using superheated steam
CA 2092826 A1 · Owner: Bauer, Volker · Inventors: Bauer, Volker; Raehse, Wilfried
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The description relates to a process for obtaining finely divided solid pourable valuable susbtances or mixtures thereof which are suitable for wetting, washing and/or cleaning agents and/or for use in such agents from their aqueous preparations by spray-drying in a stream of hot gas in the region of normal pressure. In the process of the invention, the stream of hot gas is superheat water vapour and the drying of the particulate substance is interrupted before the substance is endangered by the effects of heat whereby where necessary the pourablility during storage of the thus partly dried substance is ensured by the admixture of such additives as are capable of bonding limited quantities …
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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 September 20, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 20, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 20, 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.