ALEXANDRIA, Va., May 5 -- United States Patent no. 12,618,404, issued on May 5.
"Seal structure for reciprocating pump with cylindrical collar portion" was invented by Nobuo Tojo (Tokyo) and Yoshitaka Yamanaka (Tokyo).
According to the abstract* released by the U.S. Patent & Trademark Office: "A seal structure configured to be located between a space forming member forming a columnar inner space and a columnar reciprocating member move in the inner space. The seal structure includes an annular seal member that is configured to be located in the inner space, an annular pressing portion which is located adjacent to the seal member and is configured to press the seal member in an axial direction, a compressive coil spring which is located ad...