Did You Know...
...that after Parker Brothers executives turned down the game of Monopoly because it had "52 fundamental errors" (including taking too long to play), a copy of the game wound up in the home of the company president who stayed up until 1 a.m. to finish playing it? He was so impressed by the game that the next day he wrote to inventor Charles Darrow and offered to buy it!
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| Number | Title | Issue Date |
| 7360626 | Audio speaker with wobble free voice coil movement A speaker that is designed to substantially eliminate wobble of the voice coil during operation, and thus remove that source of distortion and early failure of the speaker. This is accomplished with the creation of triangular ring that extends upward from the top ed... | 04/22/2008 |
| 7225895 | Audio speaker with wobble free voice coil movement A speaker that is designed to substantially eliminate wobble of the voice coil during operation, and thus remove that source of distortion and early failure of the speaker. This is accomplished with the creation of triangular ring that extends upward from the top ed... | 06/05/2007 |
| 7185735 | Audio speaker with wobble free voice coil movement A speaker that is designed to substantially eliminate wobble of the voice coil during operation, and thus remove that source of distortion and early failure of the speaker. This is accomplished with the creation of triangular ring that extends upward from the top ed... | 03/06/2007 |
| 6095278 | Base for holding the tweeter of a speaker A speaker base, which includes a tweeter holder having a holder base and a bottom mounting holder rod, and withholding ring mounted on the tweeter holder to hold a tweeter, wherein the tweeter holder has an axial center through hole through its holder bas... | 08/01/2000 |
| 5471437 | Electrodynamic acoustic transducer An electrodynamic transducer has a diaphragm substantially having two parts with different profiles, namely an acoustically active central part and an annular part laterally adjoining the central part and serving for the resilient suspension of the diaphr... | 11/28/1995 |
| 4914750 | Sound transducer A sound transducer converts electrical signals into mechanical motion. A transducer comprises a transducer housing including a diaphragm section having an inner concave surface and an outer convex surface. A stem element projects outwardly from the diaphr... | 04/03/1990 |
| 4903308 | Audio transducer with controlled flexibility diaphragm An improved audio transducer includes a diaphragm having a pair of cylindrically-shaped webs that provide greater bandwidth, reduced distortion and greater horizontal dispersion of sound. The audio output of the transducer is further improved by forming t... | 02/20/1990 |
| 4567327 | Flat-diaphragm transducer and method of manufacturing such a transducer An electrodynamic transducer of the flat-diaphragm type in which the movement of the voice coil and coil former (2, 3) is transmitted to the flat diaphragm (1) via at least one auxiliary cone (8 or 20). The auxiliary cone is secured to a centering diaphra... | 01/28/1986 |
| 4477699 | Mechanical two-way loudspeaker A mechanical two way loudspeaker includes a low frequency diaphragm arranged coaxially with one another which are driven by the same voice coil. In order to flatten the sound pressure versus frequency characteristic of the loud speaker in the high frequen... | 10/16/1984 |
| 4147899 | Broadband electromagnetic sound source with differently tuned diaphragms An electroacoustic transducer particularly for small small-sized portable equipment such as a wristwatch comprises a first vibrating plate which is vibrated by means of an electromagnet and a second vibrating plate which is coupled with the first vibratin... | 04/03/1979 |
