Methods of combating pneumocystis carinii pneumonia and compounds useful therefor
CA 2104196 C · Owner: Hall, James E. · Inventors: Dykstra, Christine C.; Tidwell, Richard R.; Hall, James E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The use of a Pneumocystis carninii combatting agent is disclosed. The agent is a compound according to Formula (I), (see formula I), wherein:, R1 and R2 are each independently selected from the group consisting of H or lower alkyl, or R1 and R2 together represent -(CH2)m- wherein m is from two to four; R3 is H or lower alkyl; and, X is C1 to C12 linear or branched saturated or, unsaturated alkyl containing up to four double bonds with, the proviso that X is not -CH=CH-; or a pharmaceutically acceptable salt thereof. These agents can also be used to combat Giardia lamblia.
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 August 16, 1993 and granted March 27, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 16, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 16, 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.