ALEXANDRIA, Va., Feb. 24 -- United States Patent no. 12,560,437, issued on Feb. 24, was assigned to NextNav LLC (Santa Clara, Calif.).

"Estimating floor numbers and floor labels in a structure" was invented by Michael Dormody (San Jose, Calif.), Badrinath Nagarajan (Cupertino, Calif.), Guiyuan Han (San Jose, Calif.) and Arun Raghupathy (Bangalore, India).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method involves selecting a set of altitude envelope distribution constraints for a building and generating a set of altitude envelope distributions for the building in accordance with the constraints. Each altitude envelope distribution includes one or more first altitude envelopes. An aggregate altitude envel...