Carbonic acid esters
CA 1287358 C · Owner: Ciba-Geigy Ag · Inventors: Peter, Heinrich
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Novel carbonic acid esters, Abstract, N- and/or O-acylates derived from carbonic acid, monoesters of desferrioxamine B of the formula, (I) the symbols having the following meanings: each of AA1, AA2 and AA3, independently of the others, is hydrogen, an acyl radical, referred to as Ac, of a carbonic acid having from 1 to 24 carbon atoms, or an esterified oxycarbonyl radical referred to as Cb (acyl radical of a carbonic acid monoester) having a total of from 2 to 25 carbon atoms, and, B has one of the meanings of Cb or if at least one, of the symbols AA1, AA2 and AA3 represents Cb, it may also be hydrogen or an aminoprotecting group referred to as X, form strong iron(III) and aluminium …
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 August 6, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 6, 2008.
- 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.