US Patent Issued to Building Envelope Materials on March 17 for "System and method of injecting accurate quantities of foam into cavities without positive displacement flow meters or flow rate control apparatus" (Massachusetts, New Hampshire Inventors)

ALEXANDRIA, Va., March 17 -- United States Patent no. 12,576,565, issued on March 17, was assigned to Building Envelope Materials LLC (Lexington, Mass.).

"System and method of injecting accurate quantities of foam into cavities without positive displacement flow meters or flow rate control apparatus" was invented by Douglas W. Lamm (Lexington, Mass.) and Alexander C. Bell (Madbury, N.H.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A cavity is filled with a foam-in-place insulation by a self-contained dispensing system for which precursor vessel pressures and precursor flow rates decrease as the precursors are dispensed. Flow rate functions for the precursors are pre-calibrated as a function of vessel press...