Method for preparing antistatic expandable polystyrene
CA 1286166 C · Owner: Stickley, Susan Glessner · Inventors: Stickley, Susan Glessner
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Quaternary ammonium salts which act as antistatic agents for styrene polymers are coated on the expandable polymer particles in the form of an organosol. The hydrocarbon medium from the organosol is removed under vacuum and the coated polymer particles are molded.
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 July 16, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 16, 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.