Enhanced homogeneous polyurethane foam comfort cushioning and process for making same
CA 1320793 C · Owner: Haley, David L. · Inventors: Hostler, Paul H.; Haley, David L.; Watson, Stuart L. Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
1. Preparing a flexible polyurethane foam: a) placing a polyol polyurethane foam-forming reaction mixture in a reaction zone and allowing the mixture to rise thereby forming a partially cured cellular material, b) applying a compressive force to the partially cured cellular material after the elapsing of a period of time after completion of the rise to thereby reduce the volume of the partially cured cellular material and, c) removing the compressive force and completing the cure of the compressed cellular material. The cellular material has enhanced cushioning properties including a unique and superior feeling of comfort resulting from a soft touch yet with a deep firm support with an …
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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 27, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 27, 2010.
- 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.