Contraceptive methods
CA 1254516 A · Owner: The Victoria University Of Manchester · Inventors: Sharman, Deborah A.; Hutchinson, Francis G.; Chantler, Eric N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
i, ABSTRACT, This invention relates to the use of a bisbiguanide compound of the formula:- R1R2N.C(:NH)N:C(NH2)N-A-N.C(NH2):N.C(:NH)NR3R4 wherein either:, (i) R1 and R3, which may be the same or different are each a phenyl radical which is substituted by alkyl, alkoxy, nitro or halogen, R2 and R4 are both hydrogen, and A is a 3-9C polymethylene diradical, wherein the polymethylene chain may be interrupted by oxygen atoms and/or by aromatic nuclei; or, (ii) the bivalent bridge A is: (a) alkylene of from 2 to 12 carbon atoms having the valence bonds attached to different carbon atoms, (b) -(CH2)m-X-(CH2)n- wherein m and n each represent an integer from 2 to 6 and Y is O or S, (c) , (d) , …
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
- Granted May 23, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 23, 2006.
- 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.