Novel beta-lactam compounds and their production
CA 2036163 C · Owner: Fukasawa, Masatomo · Inventors: Nouda, Hiroshi; Sasaki, Akira; Sunagawa, Makoto
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention provides a compound of the formula: (see above formula), wherein R0 is a hydrogen atom or a protective group for hydroxyl, R1 is a lower alkyl group, R2 is a protective group for carboxyl or a negative charge, R3 is a hydrogen atom or a protective group for amino, R4 is a lower alkyl group or a substituted lower alkyl group, k is an integer of 0 to 4 X is, an acid residue or an intramolecular COO when R2 is a negative charge and Q~ is a quaternary nitrogen atom-containing group represented by either one of the formulae (1) to (4): (see formula 1), wherein R5 is a hydrogen atom a lower alkyl group or a, 2-hydroxyethyl group R6 is a hydrogen atom or a lower alkyl group …
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 February 12, 1991 and granted June 19, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 12, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 12, 2013.
- 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.