ALEXANDRIA, Va., Dec. 16 -- United States Patent no. 12,497,574, issued on Dec. 16, was assigned to Chemtech Services Inc. (Lockport, Ill.).
"Microwave extraction of essential oils" was invented by John F. Hart (Aurora, Ill.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A method of extracting an essential oil from plant matter, starting with providing plant matter to an interior of an extraction vessel, wherein the plant matter includes at least one essential oil. Next, at least one vacuum pump is used to reduce the pressure within the interior of the extraction vessel with the plant matter therein to an absolute pressure of less than 400 mm Hg absolute pressure. Microwave energy is applied to the plant mat...