U.S. patent number D336,647 [Application Number 07/779,600] 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 Akira Yamazaki.
United States Patent | D336,647 |
Yamazaki | June 22, 1993 |
Inventors: | Yamazaki; Akira (Tokyo, JP) |
---|---|
Assignee: | Sony Corporation (Tokyo,
JP) |
Appl. No.: | 07/779,600 |
Filed: | October 21, 1991 |
Jun 6, 1991 [JP] | 3-16951 | |||
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 |
D222361 | October 1971 | Hart |
D244037 | April 1977 | Warner et al. |
D254616 | April 1980 | Tabata |
D301145 | May 1989 | Besasie et al. |
D313092 | December 1990 | Nilsson |
D317767 | June 1991 | Banks |
2782423 | February 1957 | Simon et al. |
5018599 | May 1991 | Dohi et al. |
Telephony, Aug. 2, 1982 p. 15 Headset, bottom. . Radio Shack 1988 Catalog p. 44 Realistic Nova-40. . Popular Mechanics Nov. 1980 p. 96 Pickering 0A-3A Headphone.. |
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