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| Number | Title | Issue Date |
| 4521906 | Speaker systems for producing balanced stereo images at multiple locations A stereo speaker system is shown having at least three individual speakers arranged along a path, with one of the speakers positioned between the other two speakers and connected to receive signals from a selected one of a pair of left and right signal ou... | 06/04/1985 |
| 4509184 | Stereo sound system A stereo sound system for reproducing signals from two independent channels through right and left speakers. The two speakers are centrally located and propagate a lesser part of their acoustic output directly into free space. Two acoustic tunnels separat... | 04/02/1985 |
| 4445228 | Motorcycle audio system A stereo audio system for a motorcycle includes a housing (10) for a radio receiver and/or tape deck and speaker-mirror assemblies (11, 12) mounted on base-socket assemblies (13, 14) threaded over mounting posts screwed into tapped holes in place of conve... | 04/24/1984 |
| 4408095 | Acoustic apparatus An acoustic apparatus comprised of a means for extracting middle and high frequency components from left- and right-channel signals through respective high-pass filters to reproduce the components, and a means for mixing left- and right-channel signals an... | 10/04/1983 |
| 4042791 | Stereophonic head rest A stereophonic headrest adjustably communicates with a back rest of an automobile seat, comprises a central elongated rectangular shaped portion and a pair of side wing portions, wherein the side wing portions hingably communicate with the ends of the cen... | 08/16/1977 |
| 4038499 | Stereophonic pillow speaker system A stereophonic pillow speaker system is disclosed wherein first and second baffle frames and loudspeakers thereon derive near field effects at points proximal to the speakers in response to electrical signals from an amplifier. Also included are pillow me... | 07/26/1977 |
| 4020284 | Speaker system A stereo speaker system for portable use having two loud speakers mounted side by side in a common housing which may be divided. The housing substantially surrounds the speakers and the speakers substantially occupy the chamber defined by the housing. The... | 04/26/1977 |
| 3976162 | Personal speaker system An elongated arm having cooperating sections as provided which may be selectively positioned with respect to each other to vary the effective length of the arm. Carried at each end of the arm for pivotal motion is an individual speaker. The assembly is no... | 08/24/1976 |
| 3944020 | Speaker headrest for motor vehicles A stereophonic speaker headrest for motor vehicles includes a rigid interior shell and a padded cover. The rigid interior shell is generally hollow with a pair of opposed side wing members having speaker attachment structure therein for holding a speaker ... | 03/16/1976 |
