Famous Patents
3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 6898293 | Hearing aid The present invention relates to a hearing aid with an adaptive filter for suppression of acoustic feedback in the hearing aid. The hearing aid further comprises a controller that is adapted to compensate for acoustic feedback by determination of a first parameter o... | 05/24/2005 |
| 6829364 | Hearing aid with a capacitor having a large capacitance A hearing aid is provided having a capacitor with a large capacitance coupled in parallel with the energy source for transient current supply. The operating period of the battery is prolonged compared to prior art digital hearing aids. Further, the smaller variation... | 12/07/2004 |
| 6816599 | Ear level device for synthesizing music The present invention relates to an ear level electronic device comprising a housing that is adapted to be worn behind the ear, in the ear, or in the ear canal, and to enclose a music synthesizer for generation of an electrical signal representing music and an outpu... | 11/09/2004 |
| 6748093 | Hearing aid with a tightening ring The present invention relates to a hearing aid for insertion in the auditory canal, comprising a hearing aid housing and a face plate and a shell that is matched to the auditory canal of a user and has a tightening protrusion that extends along the surface of the sh... | 06/08/2004 |
| 6339647 | Hearing aid with beam forming properties A hearing aid with beam forming properties, having at least two microphone channels (1a, 1b) for at least two microphones (2a, 2b), the microphone channels each comprising an analog to digital converter (3a, 3b) and having at least one programmable or pro... | 01/15/2002 |
| 6272229 | Hearing aid with adaptive matching of microphones Hearing aid with a controllable directional characteristic having at least two spaced apart microphones (Mic 1, Mic 2) in at least two microphone channels, at least one signal processing unit, at least one output transducer and a directional controlling s... | 08/07/2001 |
| 5995636 | Hearing aid Hearing aid with a microphone, a transmission section (2) for signal processing with a housing (3) containing an output transducer, a battery compartment containing a battery (4), a cover (5) articulated at the housing or a battery lid (5a) articulated at... | 11/30/1999 |
| 5878146 | Hearing aid A hearing aid includes a microphone (1), a signal-transmission unit (2, 3,) for forming or otherwise processing the signal, an output amplifier (4) to which an earphone (10) is connected, and a battery as the power supply. The output amplifier (4) is impl... | 03/02/1999 |
| 5687241 | Circuit arrangement for automatic gain control of hearing aids A circuit arrangement for a preferably programmable hearing aid with at least one microphone, at least one electronic signal processing circuit (3), with at least one channel and one output transducer (7), in which the electronic signal processing circuit... | 11/11/1997 |
| 5578963 | Integrated amplifier with flat gain for high and low impedance loads The invention relates to a circuit arrangement for an integrated output amplifier (1) with two constant current sources (2, 3), a voltage amplifier with two inputs (5, 6) and two outputs (7, 8) and two output transistors (Q1, Q2) coupled with these, as we... | 11/26/1996 |
| 5487012 | Method of preparing an otoplasty or adaptive earpiece individually matched to the shape of an auditory canal A process for making otoplasty or adaptive ear pieces individually matched to the shape of an auditory canal and consists of the following steps: a) direct or indirect tracing is provided of the shape of the auditory canal and conversion of the values obt... | 01/23/1996 |
| 5325872 | Tinnitus masker The invention relates to a tinnitus masker with one or more signal generators, a controllable amplifier (2), one or two electroacoustic transducers (3) for conversion of electrical signals into acoustic signals and a voltage source, whereby at least one o... | 07/05/1994 |
| 5300904 | Circuit arrangement for the tank circuit of a high-frequency transmitter output stage operated with frequency shift keying The invention concerns a circuit for the resonant cavity in a frequency-shift HF transmitter output stage, with a first capacitance (2), a first inductance (3) and a first switch (5) for feeding the HF signal to the resonant cavity. To switch the resonant... | 04/05/1994 |
| 5202927 | Remote-controllable, programmable, hearing aid system A remote-controllable, programmable hearing aid system, including of a hearing aid (2) with incorporated amplifier and with a signal processing circuit whose transmission characteristic can be determined at any time by a set of control parameters, and an ... | 04/13/1993 |
| 4947432 | Programmable hearing aid The invention relates to a programmable hearing aid with an amplifier and transmission section whose transmission characteristics can be controlled, with a control unit (1), with a transmitter for wireless transmission of control signals to the hearing ai... | 08/07/1990 |
| 4800636 | Process for manufacturing an in-the-ear canal hearing aid The invention relates to a process for manufacturing an in-the-ear-canal hearing aid with microphone, amplifier, volume control, battery compartment with battery, and earphone, together with an individually matched ear-piece by making an impression of the... | 01/31/1989 |
| 4706778 | In-the-ear-canal hearing aid The invention relates to an in-the-ear hearing aid for people with impaired or defective hearing, with an ear-piece containing a microphone, amplifier, telephone, battery compartment with battery, on/off switch and volume control and closed by a cover pla... | 11/17/1987 |
| 4550227 | In-the-ear hearing aid A hearing aid which can be worn in the ear concha and which contains a microphone, an amplifier, an earphone, a battery and a connection to an ear adapter. All components are mounted in a flat, cylindrical housing (1), whose cover (2) can be rotated aroun... | 10/29/1985 |
