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...During the Civil War, the Confederacy established its own Patent Office which issued 266 patents, a third of which concerned implements of war.
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| Number | Title | Issue Date |
| 6285771 | Directional microphone assembly A microphone capsule for an in-the-ear hearing aid is disclosed. The capsule can include a top plate having first and second spaced openings defining front and rear sound inlets, and a directional microphone cartridge enclosing a diaphragm. The diaphragm ... | 09/04/2001 |
| 6134334 | Directional microphone assembly A microphone capsule for an in-the-ear hearing aid is disclosed. The capsule can include a top plate having first and second spaced openings defining front and rear sound inlets, and a directional microphone cartridge enclosing a diaphragm. The diaphragm ... | 10/17/2000 |
| 6058197 | Multi-mode portable programming device for programmable auditory prostheses A programming apparatus combination for programming an auditory prosthesis comprises a computer system and a portable programming device. The computer system comprises a general purpose operating system, a user interface for accepting auditory prosthesis ... | 05/02/2000 |
| 6047075 | Damper for hearing aid A hearing aid is set forth that includes one or more hearing aid components that introduce an undesired undamped peak into the frequency response of the hearing aid. An electronic damping filter is utilized to compensate for the undamped peak. The electro... | 04/04/2000 |
| 6009311 | Method and apparatus for reducing audio interference from cellular telephone transmissions Apparatus and method for reducing the interference of digital cellular telephones with hearing aids. A digital cellular phone is provided with a second antenna that transmits a local, low-power signal which fills in the gaps in the transmitted switched in... | 12/28/1999 |
| 5131046 | High fidelity hearing aid amplifier A high fidelity hearing aid amplifier is operable at a very low battery voltage and includes a single integrated circuit chip which provides a variable gain amplifier and gain control circuitry operative at low signal levels to enhance gain at higher freq... | 07/14/1992 |
