Penem derivatives, production and use thereof
CA 1339123 C · Owner: Iwata, Hiromitsu · Inventors: Ishiguro, Masaji; Tanaka, Rie; Iwata, Hiromitsu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention relates to novel penem compounds of the formula, (See Fig. I), wherein R is hydrogen or allyl and A is an aliphatic, 5- or 6- membered heterocyclic group having one or two oxygens in the ring and their pharmaceutically acceptable salts are produced from the compounds of the formula (See Fig. II), wherein A is the same as above and respective R1 and R2 are protective groups for hydoxyl and carboxyl groups through several steps. The compounds and their salts are useful as antibacterial agents.
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 July 29, 1997. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 29, 2014.
- 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.