ALEXANDRIA, Va., March 19 -- United States Patent no. 12,253,089, issued on March 18, was assigned to Edwards Japan Ltd. (Yachiyo, Japan).
"Vacuum pump" was invented by Haruki Suzuki (Yachiyo, Japan).
According to the abstract* released by the U.S. Patent & Trademark Office: "A vacuum pump having excellent exhaust performance is provided. The vacuum pump includes a Siegbahn type exhaust mechanism portion 201 in which a Siegbahn spiral groove portion 262 is provided in at least either rotating discs 220a to 220c or stator discs 219a and 219b, and a Holweck type exhaust mechanism portion 301 in which a thread groove 131a is provided in at least either a cylindrical portion 102d of a rotating body 103 or a threaded spacer 131, and the Holwec...