Did You Know...
...that the inventor of the electric motor was a blacksmith named Thomas Davenport? Described as "a brilliantly unsuccessful inventor", Davenport invented the first rotary electric motor. In 1836 he headed out -- on foot -- from his Vermont home to file a patent application at the Patent Office in Washington, D.C. By the time he got there, he had squandered away his money and couldn't afford the $30 filing fee so he turned around and went home. When he later mailed in his application with money he'd raised, the Patent office was destroyed in a fire. He did finally get credit for his invention on Feb. 5, 1837.
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| Number | Title | Issue Date |
| 5024612 | External ear canal pressure regulating device and tinnitus suppression device A tinnitus suppression device using an in-the-canal external ear canal pressure regulating device to alter the pressure of the fluid of the external ear canal interior of the pressure regulating device. The device has a body which can be inserted into the... | 06/18/1991 |
| 4993418 | Doppler blood flow system and method using low frequency noise signal processing A Doppler blood flow system and method in which an ultrasonic wave is reflected off of red blood cells in blood flowing in tubing. The reflected ultrasonic wave is digitally processed in the frequency domain. The flow rate of the blood is directly related... | 02/19/1991 |
| 4992966 | Calibration device and auditory prosthesis having calibration information A calibration device for an auditory prosthesis, such as a hearing aid, and an auditory prosthesis which contains such a calibration device. The calibration device comprises memory in which is stored information which is characteristic of information intr... | 02/12/1991 |
| 4989609 | Doppler blood flow system and method using special zero flow rate analysis A Doppler blood flow system and method in which an ultrasonic wave is reflected off of red blood cells in blood flowing in tubing. The reflected ultrasonic wave is digitally processed in the frequency domain. The flow rate of the blood is directly related... | 02/05/1991 |
| 4953112 | Method and apparatus for determining acoustic parameters of an auditory prosthesis using software model A software model of the auditory characteristics of an auditory prosthesis is stored independently of the actual auditory prosthesis being fitted to determine the acoustic parameters to be utilized. A transfer function of the auditory characterictics of t... | 08/28/1990 |
| 4945356 | Strip material for and a surface mounted inductive loop A strip material (18) for forming an inductive loop (10) adapted to be applied to the surface of a roadway (12). The strip material (18) consists of and the loop (10) is formed from a ductile, flexible, flattened, extensible conductor (20) and a protectiv... | 07/31/1990 |
| 4941190 | Method and system for enhancement of a digitized image A system and method of modifying pixels supplied to the system that a multiple level signals for a digitized image wherein a moving pixel window with a center pixel, Dc, is used from which the annular means, ma, of the center pixel (... | 07/10/1990 |
| 4926864 | Biological tissue stimulator with time-shared logic driving output timing and high voltage step-up circuit A biological tissue stimulator having a time-shared logic element alternately supplying switching signals to a step-up voltage circuit powered from a low-voltage power source and supplying a plurality of amplitude timing signals to an output circuit utili... | 05/22/1990 |
| 4917093 | Biological tissue stimulator with adjustable high voltage power supply dependent upon load impedance A biological tissue stimulator is disclosed having an adjustable high voltage power supply. The high voltage power supply is coupled to a battery producing a high voltage signal to be supplied to an output circuit for supplying an electrical stimulation s... | 04/17/1990 |
| 4901353 | Auditory prosthesis fitting using vectors Hearing improvement device, auditory prosthesis, hearing aid, fitting device for these apparatus and method of fitting or determining new auditory characteristic by selecting and applying a vector consisting of relative changes to a plurality of individua... | 02/13/1990 |
| 4899754 | Flat, conformable, biomedical electrode allowing removal of electrical lead wire A biomedical electrode (10) adapted to be applied to a body, the biomedical electrode (10) having a surface area divided into a first zone (38), a second zone (40), and a third zone (42). The biomedical electrode (10) has a first layer of adhesive (24) wh... | 02/13/1990 |
| 4899176 | Method of reducing average data rate in rotating mirror laser recorder A laser printer records an image on a medium as a function of digital data which is received at an input data rate. A laser beam is used for recording pixels of the image on the medium while the medium is advanced in a longitudinal direction at a controll... | 02/06/1990 |
| 4884251 | Housing for a sonic transducer A housing adapted for receiving a sonic transducer capable of projecting and receiving a sonic pattern having a primary lobe and a secondary lobe. The housing has an end wall for receiving the sonic transducer and a restrictive wall for intercepting the s... | 11/28/1989 |
