Lignin having nitrogen and sulfur
CA 1279641 C · Owner: Domtar Inc. · Inventors: Yalpani, Manssur; Magdzinski, Leon
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A product comprising lignin material having a N-content of at least 1.86% and a sulfur content of at least 3.1%, an IR in the vicinity of 1550 to 1670 cm-1 having a peak width of at least 60 cm-1. The product is also directed to such products being cross-linked and which are most suitable as chelating agents in basic medium. The product may also be used as flame retardant for, agricultural and other end uses. The invention is also directed at a method of making the above product which comprises heating a lignin containing material with thiourea H2N-C(S)-NH2: for example by heating in a solvent or melting.
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 January 29, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 29, 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.