ALEXANDRIA, Va., Feb. 11 -- United States Patent no. 12,546,886, issued on Feb. 10, was assigned to Position Imaging Inc. (Portsmouth, N.H.).

"Apparatus and method for envelope detection" was invented by Narasimhachary Nallana Chakravarty (Rollinsford, N.H.) and Rafal Piotrowski (Portsmouth, N.H.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A package management system comprises a slot including a pair of opposing spaced-apart planar surfaces on a base, and having a transmitter that generates an electromagnetic signal and a receiver in a path of the electromagnetic signal emitted by the transmitter. The system generates a signal indicative of whether the receiver senses the electromagnetic signal emitted by...