Butadiene acrylonitrile polymeric coating and chromatographic packing material
CA 2102425 A1 · Owner: Simon, Ethan S. · Inventors: Simon, Ethan S.; Mcclanahan, Christopher; Holland, Kevin B.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A chromatographic packing material includes a coated support material which is a chromatographically suitable substrate. An immobilized butadiene acrylonitrile polymer coating is provided on the substrate. The copolymer can be crosslinked by gamma radiation or by means of a crosslinking agent such as dicumyl peroxide. The support material can be silica, alumina diatomaceous earth, zeolite, porous glass or carbon but preferably is spherical lamellar, shaped crystals of aluminum hydroxide. The aluminum hydroxide crystals are bonded together at a central core and extend radially outwardly from a central core with a particle density ranging from 0.3 to 2.5 g/cm3 and a diameter of 2 to 150 …
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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 March 4, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended March 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 4, 2014.
- 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.