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Bennett invented radio frequency mass spectrometry ( 1955). . Bennett's radio frequency mass spectrometer measured the masses of atoms. It was the first such experiment in space. He also reseached gases ionized by high voltage electricity. This reseach was used in later thermonuclear fusion research. Bennett hold 70 United States and foreign patentA patent is a set of exclusive rights granted by a government to an inventor or applicant for a limited amount of time (normally 20 years from the filing date). The term "patent" originates from the term patere which means to lay open (to public inspectios.