Patent: Intravaginal ring
This invention relates to an improved intravaginal ring for use as a contraceptive comprising an inert elastomer core, a medicated layer encircling the core and an outer inert elastomer layer and method of manufacturing the intravaginal ring.
Nash, Harold A. and Daniel R. Mishell, Jr. Intravaginal ring. US Patent 4,292,965, filed 1978, issued 1981.
United States Patent 4,292,965