Patent 7584010 was granted and assigned to Able Planet on September, 2009 by the United States Patent and Trademark Office.
An improved telephone handset for hearing-impaired persons. A passive device, in the form of an inductor wound about a highly magnetostrictive core, is connected with the speaker in the handset. The device has been found to improve intelligibility of speech delivered by the handset, when perceived by persons afflicted with certain types of hearing impairment.