Cationic and anionic lignin, amines
CA 1298831 C · Owner: Schilling, Peter · Inventors: Brown, Patti E.; Schilling, Peter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Case Docket No. CHR 84-4, CATIONIC AND ANIONIC LIGNIN AMINES Abstract of the Invention, Lignin amines are disclosed which are characterized by high nitrogen content and are water soluble at both alkaline and acidic pH values. The lignin amines have utility as flocculants filtration aids, precipitants, scale inhibitors asphalt, emulsifiers, fluid loss additives oil well cement additives, corrosion inhibitors retention aids, cationic dispersants, and tall oil pitch emulsifiers.
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 April 14, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 14, 2009.
- 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.