Preparation and magnetic properties of very small magnetite-dextran particles
CA 2107280 A1 · Owner: Eastman Kodak Company · Inventors: Yudelson, Joseph S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to particles comprised of a magnetically responsive material and a dispersant, said particles having a particle size range of about 2 to about 10 nm. The present invention is also directed to a method for the preparation of such particles comprising admixing a magnetically responsive material with a dispersant to form an admixture, and contacting said first admixture with a base for a time period and under conditions appropriate to form a magnetically responsive material-dispersant particle. In a preferred embodiment the magnetically responsive material is magnetite the, dispersant is dextran, and the base is ammonium hydroxide. In a further preferred …
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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 29, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 29, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 29, 2015.
- 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.