Impact energy-absorbing urethane foam
CA 1076748 A · Owner: Mccord Corporation · Inventors: Flanagan, Kirby E.L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An impact energy-absorbing, relatively low density urethane foam for use in automobile bumpers has a high content of urea linkages and is relatively temperature insensitive i.e. gives approximately the same physical performance over a wide range of temperature. The foam is water blown in a closed mold from a quasi-prepolymer system. The pack factor is preferably in the range of 1.5 to 8 and the molded density is in the range of 5 to 20 lbs/ft.3. The foam formulation is based on a prepolymer polyol of a poly (oxypropylene) trio capped with a styrene/acrylonitrile copolymer which is reacted with a 50 to 150 equivalent weight amine or polyol crosslinker of 2 to 6 functionality and with a …
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 April 29, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 29, 1997.
- 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.