Therapeutic hemoglobin composition having isotropically increased size
CA 2296700 A1 · Owner: Nelson, Deanna J. · Inventors: Hai, Ton That; Nelson, Deanna J.; Pereira, David E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel polysaccharide compounds are disclosed for decorating biomolecular surfaces to increase isotropic size and mask antigenicity. The oligosaccharides may by synthesized as repeating disaccharide units or may be , derived by acid hydrolysis of naturally occurring polysaccharides. Such natural sources include chondroitins obtained from shark cartilage or , hyaluronic acid. The polyanionic sulfate groups contained in the sugar moieties impart negative charges which repel the molecules from the negatively charged wall of capillaries, to lengthen retention times of decorated drug molecules, such as cross-linked hemoglobin in the peripheral circulation.
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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 June 22, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended June 22, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 22, 2020.
- 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.