Foaming and vulcanizing of elastomeric polymers
CA 1262998 C · Owner: Atochem North America, Inc. · Inventors: Kmiec, Chester J.; Novits, Michael F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Closed-cell crosslinked sponges of varying densities are prepared from an admixture of a vulcanizable elastomer vulcanizing ingredients selected from sulfur or sulfur donor compounds together with metal oxides and/or sulfur vulcanization accelerators and a t-alkylhydrazinium salt and/or carbonylhydrazine. The crosslinked sponges have uniform cellular structures and are easily prepared with the desired density.
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 November 14, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 14, 2006.
- 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.