Immunodiagnostic assay for rheumatoid arthritis
CA 2082529 A1 · Owner: Nayyar, Sarita · Inventors: Lewin, Ian V.; Nayyar, Sarita; Stanworth, Denis R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The assay of rheumatoid arthritis by reference to IgA-.alpha.1-antitrypsin complex present in analytes is facilitated by certain novel antibody reagents. These are ligands comprising an antibody domain specific for an antigenic determinant of a complex of human IgA and .alpha.1-antitrypsin, said antibody domain being substantially non reactive with free human IgA and free human .alpha.1-antitrypsin. Monoclonal antibodies to the naturally occurring IgA-.alpha.1AT complex and monoclonal or polyclonal antibodies to a synthetic peptide are preferred. The synthetic peptide in itself part of the invention and preferably has an amino acid sequence: …
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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 May 24, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 24, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 24, 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.