Assay for serum cholinesterase
CA 2095495 C · Owner: Clinical Diagnostic Systems, Inc. · Inventors: Engebrecht, Ronald Henry; Hasselberg, Stephen Carl; Babb, Bruce Edward
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Cholinesterase activity is determined by means of the choline obtained by the action of cholinesterase on a compound of the formula: (see formula I), wherein R and R1 can be the same or different and can be, alkyl, such as methyl, ethyl propyl, butyl, isopropyl, etc.; alkoxy such as methoxy, ethoxy, propoxy, butoxy etc.; amino (-NR2R3), wherein R2 and, R3 can be the same or different and can be hydrogen, methyl, ethyl, or propyl wherein X- is a methyl or an, anion, such as halogen (chloro bromo, or iodo) sulfate, nitrate and acetate; The method of the invention ensures a, conveniently low rate of cholinesterase catalyzed hydrolysis and a high degree of accuracy. Certain compounds of formula …
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 May 4, 1993 and granted June 4, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 4, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 4, 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
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.