A pyrrolidylthiocarbapenem derivative
CA 2203942 C · Owner: Nishitani, Yasuhiro · Inventors: Nishino, Yutaka; Nishitani, Yasuhiro; Irie, Tadashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pyrrolidylthiocarbapenem derivative, represented by Formula I is provided: (see Fig. I), wherein R1 is hydrogen or lower alkyl; R2 R3, and R4 are hydrogen, lower alkyl which can be substituted or an amino protecting group independently or R2, and R3 together with a nitrogen atom to which R2 and R3 are bonded form a saturated or unsaturated cyclic group, or R2 and R4, or R3 and R4 together with two nitrogen atoms and one sulfur atom in the sufamide group form a saturated or unsaturated cyclic group; each cyclic group can further include at least one atom selected from the group consisting of oxygen sulfur, and nitrogen, and each cyclic group can be substituted; X1 is hydrogen or a hydroxy …
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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
- Filed August 19, 1992 and granted February 13, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 19, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 19, 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.