Method for using recycled glass as a filler in molded plastics
CA 2278799 C · Owner: Hansen, Richard W. · Inventors: Hansen, Richard W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The use of comminuted, recycled glass powders as a filler in molded plastic parts is disclosed. The recycled glass preferably has rounded edges which is , a distinct advantage over conventional ground glass which has extremely sharp edges. Suitable comminuted glass is free from contaminants such as grinding compounds. The comminuted recycled glass filler can be used with a variety of different thermoplastics commonly used in injection molding rotational , molding, and blow molding of plastic parts.
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
- Filed January 12, 1998 and granted July 29, 2003. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 12, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 12, 2020.
- 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.