Methods for fine powder formation
CA 2575973 A1 · Owner: Steiner, Solomon S. · Inventors: Feldstein, Robert; Steiner, Solomon S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improved methods for forming fine particles of a material have been developed wherein the method steps include dissolving the material in a solvent to form a dilute, solution, immobilizing the dilution solution and then removing the solvent to , yield particles of the material. Methods of immobilizing the dilute solution include freezing, gelation, and chelation. In a preferred embodiment the immobilized solvent is , removed, by lyophilization i.e. reducing the ambient pressure while avoiding application of, sufficient heat to power a phase transition. Essentially any material and solvent for the, material can be used in the methods described herein. Proteins and peptides in an, …
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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 April 5, 2000. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 5, 2020.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 5, 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
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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.