ALEXANDRIA, Va., June 5 -- United States Patent no. 12,275,817, issued on April 15, was assigned to SIKA TECHNOLOGY AG (Baar, Switzerland).
"Hardener for epoxy resins" was invented by Edis Kasemi (Zurich, Switzerland), Andreas Kramer (Zurich, Switzerland), Ursula Stadelmann (Zurich, Switzerland) and Urs Burckhardt (Zurich, Switzerland).
According to the abstract* released by the U.S. Patent & Trademark Office: "A curing agent for epoxy resins, including at least one amine A1 of the formula (I) and at least one amine A2 which is a polyalkyleneamine or polyethyleneimine, where the weight ratio between amine A1 and amine A2 is in the range from 20/1 to 1/2. The curing agent of the invention enables inexpensive and low-emission epoxy resin pr...