Polyacrylamide gel matrix
CA 2113178 A1 · Owner: Advanced Applications Institute Incorporated · Inventors: Mirsky, Jeffrey; Schwartz, Arthur L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Method for forming a solid gel matrix including contacting, together in an alkaline solution: (a) polyacrylamide molecules having one or more amide groups and (b) an aldehyde adapted to covalently bond with at least two of the amide groups on separate polyacrylamide molecules to covalently bond the separate polyacrylamide molecules together. In the method sufficient covalent bonds are formed between the polyacrylamide molecules to cause the solution to form a solid gel matrix.
Read the whole patent
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 July 17, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended July 17, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by July 17, 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.