Famous Patents
Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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 |
| 5201006 | Hearing aid with feedback compensation In a hearing aid with feedback compensation by virtue of at least one secondary microphone feeding into a delay unit and an attenuator feeding into one input of a difference amplifier, the other input with opposite polarity of which is connected to the ou... | 04/06/1993 |
| 5195139 | Hearing aid A hearing aid in which selected frequency components of sound being vented from the ear canal of the user of the hearing aid to eliminate the "occlusion effect" are conducted to an acoustically isolated cavity to eliminate, or greatly reduce, feedback in ... | 03/16/1993 |
| 5091952 | Feedback suppression in digital signal processing hearing aids Acoustic feedback in digital signal processing hearing aids is suppressed by using signal processing techniques in the digital processor. A first processing technique causes the data to the main signal processing path in the digital signal processor to be... | 02/25/1992 |
| 5033090 | Hearing aid, especially of the in-the-ear type In a hearing aid with a microphone, an amplifier and a receiver supplying amplified sound to the user, a second signal path is provided comprising a second, feedback-suppressing microphone, placed at a location to receive feedback-causing sound from the r... | 07/16/1991 |
| 5029217 | Digital hearing enhancement apparatus An apparatus and technique for enhancing the hearing capabilities of persons by providing a device which is a model of the desired hearing characteristic of the persons.... | 07/02/1991 |
| 5003606 | Antihowling hearing aid In order to prevent howling in a hearing aid (10) having a microphone (1), an amplifier (3) and a receiver (4) the hearing aid is provided with a second microphone (2) which is only sensitive to sound near to it. The microphones (1, 2) are connected to th... | 03/26/1991 |
| 4879749 | Host controller for programmable digital hearing aid system A host controller for producing data from a computer for a programmable filter of a hearing aid to cancel feedback in which phase shift and gain control means as adjusted by the computer to generate a feedback cancellation voltage which is supplied to the... | 11/07/1989 |
| 4845757 | Circuit for recognizing oscillations in a useful signal due to feedback between acoustic input and output transducers A circuit arrangement for suppressing oscillations, such as acoustic feedback in a hearing aid, has a circuit which recognizes the presence of oscillations in a useful signal, an oscillatory frequency search circuit, and an oscillation modifying circuit c... | 07/04/1989 |
| 4731850 | Programmable digital hearing aid system A hearing aid system comprises a hearing aid that is programmable so as to have optimum electro-acoustic characteristics for the patient and acoustic environment in which it is used. Selected optimum parameter values are programmed into an electronically ... | 03/15/1988 |
| 4185168 | Method and means for adaptively filtering near-stationary noise from an information bearing signal An input signal containing information such as speech or music as well as near-stationary noise is applied in parallel to a noise-analysis circuit and a noise-reduction circuit, each of which comprises a plurality of bandpass filters covering the range of... | 01/22/1980 |
| 4109116 | Hearing aid receiver with plural transducers A hearing aid has an electroacoustic transducing means involving face-to-face diaphragms that are driven in opposite directions to avoid imparting mechanical vibrations to the case and thus to reduce acoustic feedback occasioned by case vibrations. The di... | 08/22/1978 |
