Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7010007 | Light-emitting diode lighting circuit A lighting circuit including a circuit for preventing erroneous illumination of LEDs wherein the lighting circuit, serving as a drive circuit for the LEDs, includes a transistor and a differential amplifier placed at a preceding stage of the transistor. A positive i... | 03/07/2006 |
| 4206674 | DC offset correction circuit for an electronic musical instrument A DC offset correction circuit for use in an electronic organ for eliminating audible noise or thump produced by an instantaneous DC level shift in the standard organ keyer circuit at both key depression and release. A standard keyer circuit is responsive... | 06/10/1980 |
| 4136595 | Single bus keyboard An inexpensive single bus keyboard circuit for voltage controlled electronic musical instruments. The keyboard signal voltage is sampled and stored after each depression of a key, or release of a key when other keys are held in a depressed state, and a ga... | 01/30/1979 |
| 4117758 | Binary word debouncer A special circuit arrangement intended for use with electronic organs and the like, and particularly intended for use with electronic organs having playing key operated switches and in which at least a portion of the switches actuated by keys of a keyboar... | 10/03/1978 |
| 3960043 | Filter circuit A filter circuit for use in a musical instrument, such as an electronic organ, eliminating undesirable keying transients introduced into the signals provided by tone generators of the organ. The filter circuit includes a bandpass filter filtering from the... | 06/01/1976 |
| 3945290 | Device for producing a vibrato effect for accoustic signals The invention relates to an apparatus for producing a vibrato effect in acoustic signals, particularly for electronic organs, in which the output signals are obtained by successively scanning a plurality of points of a delay line fed by the acoustic signa... | 03/23/1976 |
