ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,498,358, issued on Dec. 16, was assigned to Twinvay GmbH (Waldbronn, Germany).
"Bracelet to test for knock-out drops" was invented by Kim Eisenmann (Karlsruhe, Germany) and Sven Hauser (Karlsruhe, Germany).
According to the abstract* released by the U.S. Patent & Trademark Office: "A bracelet includes a band formed with or from a test strip that includes at least one field with dried chemical substance. The dried chemical substance has a first color tone, and the bracelet is configured to indicate the presence of K.O. drops by the addition of liquid to the at least one field having the dried chemical substance."
The patent was filed on Oct. 2, 2020, under Application No. 17/754,494....