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 |
| 4867571 | Wave form filter pulse detector and method for modulated signal A device and method for determining pulses in a modulated signal is disclosed. The modulated signal is processed and converted into a quantized analog type of digital data stream. The data stream is evaluated over time by considering preceeding and subseq... | 09/19/1989 |
| 4824242 | Non-invasive oximeter and method The present invention relates to an oximeter for monitoring oxygen saturation of arterial blood. Light of two wavelengths is transmitted through a specimen. Detectors measure the attenuation of light through the specimen to produce two modulating data str... | 04/25/1989 |
| 4821709 | High frequency ventilator and method A high frequency ventilator which generates a high frequency pressure wave in a supply of ventilating gas for supporting ventilation in air breathing animals. The high frequency pressure wave causes the ventilating gas to be exchanged and to diffuse throu... | 04/18/1989 |
| 4805612 | High frequency ventilation A high frequency oscillating ventilator. A flow of gas is conducted from a gas source to a high frequency oscillator. The high frequency oscillator comprises a housing including a magnet and having a diaphragmetically sealed piston mounted therein, an inl... | 02/21/1989 |
| 4805122 | Temperature control system for cutaneous gas monitor A temperature control system for an electrically heated cutaneous gas sensor. A heating element is provided with heating current by a closed loop temperature control circuit. The system includes a plurality of temperature monitoring circuits which are arr... | 02/14/1989 |
| 4705617 | Apparatus for deplating cutaneous gas sensors An improved method and apparatus for deplating the electrodes of cutaneous oxygen sensors. A controllable voltage source selectably establishes either a polarizing voltage or a deplating voltage between the electrodes of a cutaneous oxygen sensor, while a... | 11/10/1987 |
| 4697450 | Gas monitor having trend indicators An improved device for determining the trend of the partial pressure of a gas, such as oxygen or carbon dioxide, which diffuses outwardly through a patient's skin. The device, such as a cutaneous gas monitor, generates over time a series of partial pressu... | 10/06/1987 |
| 4601293 | Temperature control system for cutaneous gas monitor A temperature control system for an electrically heated cutaneous gas sensor. A closed loop temperature control circuit varies the current through the heating element, in accordance with the sensed temperature of the sensor, to maintain the sensor at a te... | 07/22/1986 |
| 4586149 | Temperature control system for cutaneous gas monitor A temperature control system for an electrically heated cutaneous gas sensor. A heating element is provided with heating current by a closed loop temperature control system. The system includes a plurality of temperature monitoring and control circuits wh... | 04/29/1986 |
| 4581714 | Method of calibrating and linearizing the output of fluid measuring instruments A method for calibrating and linearizing the output of an instrument that includes a transducer having an output that is a nonlinear function of a property of interest of a fluid. The results of measurements performed on a plurality of transducers of the ... | 04/08/1986 |
| 4546793 | Breath switch An improved switching device for indicating the beginning and ending of the breath of a test subject. A flow through housing is provided with an inlet and first and second outlets. A flexible diaphragm is connected in series with the first outlet to serve... | 10/15/1985 |
| 4537058 | Volume calibration syringe A calibration syringe for controllably delivering gas to a respiratory gas measuring instrument during the calibration thereof. In addition to the piston and cylinder arrangement used in prior syringes, the calibration syringe of the invention includes se... | 08/27/1985 |
| 4509551 | Breath switch An improved switching device for indicating the beginning and ending of the breath of a test subject. A flow through housing is provided with an inlet and first and second outlets. A flexible diaphragm is connected in series with the first outlet to serve... | 04/09/1985 |
| 4448058 | Respiratory gas analysis instrument having improved volume calibration method and apparatus An improved gas volume calibration method and apparatus for use in respiratory gas analyzers. A control unit monitors the flow of calibration gas through the analyzer by monitoring the electrical signals produced by a gas turbine and a breath switch. Duri... | 05/15/1984 |
