U.S. patent number D274,753 [Application Number 06/422,860] was granted by the patent office on 1984-07-17 for middle ear ventilation tube. Invention is credited to Beverly W. Armstrong.
United States Patent | D274,753 |
Armstrong | July 17, 1984 |
Inventors: | Armstrong; Beverly W. (Charlotte, NC) |
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Appl. No.: | 06/422,860 |
Filed: | September 24, 1982 |
Current U.S. Class: | D24/173 |
Field of Search: | ;D24/8,34,35,53,54,59,67 ;128/1R,151,305,152 ;604/264,280,281,282 ;181/130,134,135 |
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