Process for producing flexible polyurethane foam using hexahydro-s-triazine catalysts
CA 1312975 C · Owner: Westfall, Paul Marlin · Inventors: Westfall, Paul Marlin; Critchfield, Frank Edward; Baker, Otis Madisson Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Hexahydro-s-triazines, and in particular hexamethylenetetramine (HMT), can be used in high water (5.0 or more parts per hundred parts of polyol) flexible polyurethane foams formulations in place of conventional gellation catalysts to produce open celled molded foams with excellent surfaces and with cores free of discoloraton. D-15822
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 January 19, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 19, 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.