U.S. patent number D336,646 [Application Number 07/797,288] was granted by the patent office on 1993-06-22 for headphone. This patent grant is currently assigned to Sony Corporation. Invention is credited to Hidefumi Gotoh, Toshio Iribe, Akira Yamazaki.
United States Patent | D336,646 |
Yamazaki , et al. | June 22, 1993 |
Inventors: | Yamazaki; Akira (Tokyo, JP), Iribe; Toshio (Tokyo, JP), Gotoh; Hidefumi (Tokyo, JP) |
---|---|
Assignee: | Sony Corporation (Tokyo,
JP) |
Appl. No.: | 07/797,288 |
Filed: | November 25, 1991 |
Jun 5, 1991 [JP] | 3-16551 | |||
Current U.S. Class: | D14/205 |
Field of Search: | ;D21/204-206,223 ;D29/19 ;181/129 ;379/430,444 ;381/25,68,158,183,187 |
D228352 | September 1973 | Itagaki |
D229833 | January 1974 | Becker |
D235210 | May 1975 | Hill |
D244037 | April 1977 | Warner et al. |
D254183 | February 1980 | Doodson |
D255352 | June 1980 | Besasie |
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D317767 | June 1991 | Banks |
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5018599 | May 1991 | Dohi et al. |
Popular Mechanics, Nov. 1980 p. 96, model AKG K-340, right side. . Telephony, Aug. 2, 1982 p. 15, headset, bottom. . Dak Industries, p. 9 headset, top. . Radio Shack 1988 Cat. Realistic Nova-40 headphones.. |
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