Gynaecological procedure
CA 2001333 A1 · Owner: The Victoria University Of Manchester · Inventors: Sharma, Rekha; Chantler, Eric N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method for treatment of semen/spermatozoa to enhance their ability to fertilise ova, using a reagent solution containing a protease (especially chymotrypsin) and a saccharide (especially D-galactose) to remove antagonistic antibodies and protect the spermatozoa. The treated spermatozoa are freed from extraneous materials by washing and concentrated by centrifugation and may, then be used in assisted conception techniques. They may be preserved by conventional means. Also provided is a convenient form of "kit" for easy clinical preparation of the reagent solution.
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 October 24, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 24, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 24, 2011.
- 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.