Did You Know...
...that the first rickshaw was invented in 1869 by an American Baptist minister, the Rev. E. Jonathan Scobie, to transport his invalid wife around the streets of Yokohama?
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| Number | Title | Issue Date |
| 5525766 | Portable acoustical shell structure A portable acoustical shell for the performing arts and the like, and which includes a plurality of generally quadrilateral, and preferably trapezoidal, sound reflecting panels arranged together as an assembly along adjacent long side edge margins in subs... | 06/11/1996 |
| 5403979 | Easily raisable and lowerable telescopic shell tower acoustic system and methods of making and using the system An acoustic shell tower module of sound enhancing character assemblable with other such towers to form an orchestral shell, has a first sound enhancing panel mounted on a generally horizontally rearwardly extending counterweighting base. A second sound en... | 04/04/1995 |
| 5268539 | Acoustic apparatus An acoustic apparatus adapted to be heard only by a specific person or persons in one space without being worn by the user as in the case of an earphone. Sounds issuing from the apparatus do not leak to the outside and are not affected by the surrounding ... | 12/07/1993 |
| 5250763 | Acoustical equalization device system An acoustical equalization device is designed to be attached to the front of a stereo speaker and includes a plurality of moveable baffles which may be used to either reflect or absorb sound waves being emitted from the speaker. The baffles can be slidabl... | 10/05/1993 |
| 5168129 | Variable acoustics modular performance shell A performance shell is disclosed which includes a plurality of modular components which may be assembled together to surround a performing entity ranging from a single soloist to a full orchestra. Modular components may be added and subtracted as desired ... | 12/01/1992 |
| 5141073 | Trapezoidal sound absorption module A trapezoidal-shaped acoustic absorber is designed for use in music recording studios. The absorber is configured in the shape of a right trapezoidal prism and has an internal transverse pegboard partition which divides the absorber into a plurality of ch... | 08/25/1992 |
| 5123874 | Knock-down sound attenuating system A knock-down sound attenuating system (10) is provided as a portable enclosure having significant sound attenuating properties, while still being easily assembled and disassembled. The knock-down sound attenuating system (10) includes a plurality of sound... | 06/23/1992 |
| 4991219 | Sound simulation chamber A sound simultation chamber having a top, lower edge, and sides with speakers attached to the inside surface of the sides near the lower edge, front and rear. The speakers are mounted so that they can be oriented in any of several directions so that an au... | 02/05/1991 |
| 4942938 | Space unit for the recording and/or reproduction of acoustic signals A space unit for the recording and/or reproduction of acoustic signals on and/or from sound carriers is described. The space unit is formed as transportable space cell which is adapted to be installed in closed rooms or out of doors. Recording means and/o... | 07/24/1990 |
| 4832147 | Sound reduction membrane A volumetric sound absorber for audible sound frequencies is made from a thin sheet material that is permeable to air with thickness mass, and flow resistance within specified ranges.... | 05/23/1989 |
| 4823908 | Directional loudspeaker system A parametric loudspeaker utilizes nonlinearity of air relative to ultrasonic waves for producing an audio frequency having super directivity, and to thus provide a limited listening area public address system subject to a large listening area by safeguard... | 04/25/1989 |
| 4805731 | Sound projection method and apparatus An acoustical reflector is positioned in such manner relative to a loudspeaker as to reflect all of the indirect sound waves generated as a necessary concomitant to the generation of direct sound waves by the loudspeaker substantially only to the audience... | 02/21/1989 |
| 4750586 | Multi-tubular acoustic baffle system A multi-tubular acoustic absorber panel system suited particularly for use in open office environments or workspaces with unwanted echoes, excessive noise, or the need for enhanced acoustic privacy. The basic components of the system are a series of sound... | 06/14/1988 |
| 4605088 | Multidirectional sound absorber A multidirectional sound absorber which is adapted to be mounted on an exterior surface of a wall and includes a substantially flat base made of a relatively low density, sound absorbing material, and an outer layer made of a relatively high density, soun... | 08/12/1986 |
| 4605093 | Device for absorption of sound waves A device having a high sound absorption ability and intended for use as floor, wall and/or ceiling facing in so-called echo-free rooms (10), i.e. in acoustic measuring rooms designed according to international standard, ISO-3745, in picture and sound reco... | 08/12/1986 |
| 4515238 | Portable acoustical shield and sound enhancing closure A portable acoustical shield and sound enhancing enclosure including vertical lower panel sections connected to each other by removable Velcro.RTM. hinges to form a shield or enclosure of a desired configuration. Upper panel sections are secured to the lo... | 05/07/1985 |
| 4366882 | Sound room A sound room having sound wave reflective front and side walls, and ceiling and a sound absorbent floor and rear wall arranged to form a wedge shaped room. Sound generating speakers are positioned at the upper front wall forming the small end of the wedge... | 01/04/1983 |
| 4362222 | Arrangement for damping and absorption of sound in rooms An acoustical system for damping and absorption of sound in rooms to provide a sound damping even at very low frequencies, e.g. 50 Hz, and simultaneously improve speech comprehension in the entire room by reduction of the resonance time. The acoustic abso... | 12/07/1982 |
| 4356880 | Acoustical reflectors A sonic reflector comprising three mutually perpendicular walls of sound reflective material each of a generally right triangular shape. Plural arrays of such reflectors provide acoustical panels useful in assisting performers in monitoring their own perf... | 11/02/1982 |
| 4278145 | Concert shell A concert shell for use either indoors or outdoors wherever music is performed so as to enhance the acoustical quality of the music, and which shell is readily portable, light weight, and which can be readily assembled and disassembled. It comprises a plu... | 07/14/1981 |
| 4190739 | High-fidelity stereo sound system Sound reproduction systems using sound reflectors and the reflectors for the same are disclosed. Passive reflectors for redirecting sound from speakers spaced therefrom are described in several configurations. Two horizontally spaced loudspeakers, direct ... | 02/26/1980 |
| 4183290 | Air vent Sound-absorbing air vent for rooms having openings that are selectively opened or closed by an electrical motor which is controlled by a sound-sensitive element.... | 01/15/1980 |
| 3975850 | Portable display device A portable display device is disclosed for use at trade shows and exhibitions which comprises a light-weight collapsible frame and a plurality of visual display panels which may be attached to the frame. The display stand provides a visually-appealing gra... | 08/24/1976 |
