ALEXANDRIA, Va., June 6 -- United States Patent no. 12,280,514, issued on April 22.
"Handheld safety knife" was invented by Jeffrey Allen Kempker (Spring Lake, Mich.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A handheld safety knife is disclosed herein which comprises a removable blade cartridge installed into a handle having a cartridge recess. The cartridge recess retains the blade cartridge within the handle through one or more of the following: a contoured side wall matching that of the removable blade cartridge; a plurality of anti-rotation protrusions which are located in the cartridge recess; or a cartridge orientation feature which mates with a cavity located in the removable blade cartridge. Whe...