2,7-bis-basic esters and ethers of 9-benzylidenefluorene
CA 1049549 A · Owner: Richardson-Merrell (Canada) Ltd. · Inventors: Roberts, Edward M.; Claxton, George P.; Andrews, Edwin R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel 2,7-bis-basic derivatives of 9-(substituted) benzylidenefluorene having the formula wherein n is an integer of from 2 to 6 Y is selected from, the group consisting of oxygen and the radical ?-O R and, R1 are lower alkyl having from 1 to 6 carbon atoms R2 is, hydrogen or cyano, or a pharmaceutically acceptable acid addition salt thereof, their preparation and use for the prevention and inhibition of viral infections are disclosed.
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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 February 27, 1979. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 27, 1996.
- 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.