ALEXANDRIA, Va., March 31 -- United States Patent no. 12,588,826, issued on March 31, was assigned to Polar Electro Oy (Kempele, Finland).
"Photoplethysmogram sensor arrangement" was invented by Elias Pekonen (Kempele, Finland).
According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus includes the following: a photoplethysmogram sensor head including a light emitter and a photo detector, wherein the photo detector is disposed in a diagonal orientation with respect to a light path from the light emitter to the light detector; and an opaque mask over the photo detector, wherein the mask covers at least partially that half of the photo detector that is at a greater distance from the light emitter and leaves a ...