ALEXANDRIA, Va., April 9 -- United States Patent no. 12,269,907, issued on April 8, was assigned to NOK Corp. (Japan).
"Rubber composition containing ethylene-propylene-nonconjugated polyene copolymer" was invented by Tetsuro Negami (Tottori, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A rubber composition is provided which is excellent in crosslinking characteristics and processability and is excellent in durability and heat resistance after crosslinking by using a sulfur-based crosslinking agent and a peroxide crosslinking agent in combination. The rubber composition includes 100 parts by mass of ethylene-propylene non-conjugated polyene copolymer, 1 to 3 parts by mass of peroxide crosslinking age...