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| Number | Title | Issue Date |
| 4071112 | Horn loudspeaker A loudspeaker with a driver and horn in which the horn has a channel expanding in cross section exponentially from the throat of the horn to a second portion, the second portion expanding conically to a rapidly flaring bell portion which terminates in the... | 01/31/1978 |
| 4050541 | Acoustical transformer for horn-type loudspeaker An acoustical transformer or "phasing plug" for coupling sound from a speaker diaphragm to the throat of a horn. The phasing plug of the invention is in the general shape of a dome on one side and a truncated cone on the other, and has evenly spaced radia... | 09/27/1977 |
| 4040503 | Horn speaker A horn speaker comprising a diaphragm positioned close to a throat and side walls forming sound passages for radiating the vibrations of the diaphragm effectively as sound waves from the mouth of the speaker.... | 08/09/1977 |
| 4031337 | Loudspeaker A loudspeaker consisting of a driver or motor unit consisting of a cylindrical magnet structure, a voice coil and a domed diaphragm; an enclosure unit for receiving therein the driver or motor unit; and a horn unit attached mechanically to the opened end ... | 06/21/1977 |
| 4002897 | Opto-acoustic telephone receiver An opto-acoustic telephone receiver, for converting optical signals propagating in an optical fiber waveguide into audible acoustic signals, includes an optical absorption cell having a volume of the order of 10-.sup.3 cm3, acoustica... | 01/11/1977 |
| 3972385 | Horn speaker A horn speaker comprising a diaphragm positioned close to a throat and side walls forming sound passages for radiating the vibrations of the diaphragm effectively as sound waves from the mouth of the speaker.... | 08/03/1976 |
