Use of formate salts as auxiliary agents for low density rigid foams
CA 2106796 C · Owner: Reichel, Curtis J. · Inventors: Reichel, Curtis J.; Christman, Donald L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
It has been found that in addition to acting as an auxiliary blowing agent various, salts of formic acid may be used to tailor the reactivity characteristics of rigid polyurethane, foam formulation. Salts of particular interest are: ammonium formate sodium formate, and potassium formate. By varying amounts and combinations of the above salts characteristics of a formulation's reactivity such as cream time gel time, rise time, and, tack-free time may be manipulated.
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 September 23, 1993 and granted December 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 23, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 23, 2015.
- 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.