Novel cyclic urea derivative
CA 2006848 A1 · Owner: Tsuboniwa, Noriyuki · Inventors: Tobinaga, Kenshiro; Sakamoto, Hiroyuki; Tsuchiya, Yasuyuki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is cyclic urea derivatives represented by the following formula (A):, (A), wherein n is an integer of 0 or 1; m is an integer of 1 to 15; X is oxygen, sulfur or -NR1- (R1 is hydrogen or an alkyl group having 1 to 5 carbon atoms); R is an alkylcycloalkyl -, aryl-, aralkyl-, alkaryl- and glycidyl group having 1 to 27 carbon atoms, or an alkylcycloalkyl-, aryl-, aralkyl- and alkaryl group containing at least one , O, S and N and having 1 to 27 carbon atoms with a molecular weight of 15 to 500, said groups substituted by glycidyl-, hydroxylic, nitro groups, halogens cyano-, formyl- or amino groups, or polyester polyether-, polyurethane and polyamide groups having a molecular weight of …
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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 December 28, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended December 28, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by December 28, 2011.
- 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.