ALEXANDRIA, Va., Feb. 3 -- United States Patent no. 12,540,889, issued on Feb. 3, was assigned to IMPETUX OPTICS S.L. (Barcelona, Spain).

"Microrheological measurements in a viscoelastic medium" was invented by Paolo Antonio Frigeri (Origlio, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method and apparatus for performing microrheological measurements in a viscoelastic medium by employing at least two optical traps, generated from a single laser source, acting on a single particle located in viscoelastic medium. The method uses an improved back-focal-plane interferometry (BFPI) procedure to obtain the complex shear modulus of the medium."

The patent was filed on Aug. 9, 2023, under Applicati...