Leather
CA 1332661 C · Owner: Manzo, Giovanni · Inventors: Manzo, Giovanni
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Leather products that are well lubricated impermeable and, water-repellent are produced by impregnating tanned leather under alkaline conditions with an aqueous emulsion of carboxylic acids or anhydrides containing at least 25 carbon atoms, in particular polyisobutenyl succinic acid or its anhydride containing at least 30 carbon atoms or its, sulphonic derivative followed by retanning with basic solutions or with the emulsion which is also covered may additionally contain fatty acids.
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 October 25, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 25, 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.