Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4178623 | Measuring sensor for capacitive measurement of liquids at selected levels The parts of a measuring sensor include an electrode mounted on a conductive body and insulated therefrom. Part of the electrical capacitance between the electrode and the body is determined by the dielectric constant and conductivity of the material in w... | 12/11/1979 |
| 4176553 | Liquid level measuring system A method and apparatus for measuring the level of a liquid in a storage tank having a predetermined reference level. A liquid level sensor is located in the tank so as to monitor the upper level of liquid over a predetermined height range at a plurality o... | 12/04/1979 |
| 4173892 | Apparatus for measurement of quantity of liquid in container Apparatus is provided for generating a signal proportional to the quantity of a substance in a container composed of electrically non-conducting material. The container is converted into an electrical condensor by mounting a pair of electrically isolated ... | 11/13/1979 |
| 4137558 | Instrument probe assembly having continuous probe insulation There is disclosed a probe assembly suitable for mounting in a pressure vessel and the like which has an elongated probe member with a continuous and unbroken insulation coating that is received within an assembly body. The latter has attachment means to ... | 01/30/1979 |
| 4099167 | Capacitive means for measuring the level of a liquid Electrodes are disposed on portions of a container comprising dielectric material, an electrical signal is capacitively transmitted between said electrodes, said electrical signal is shunted by the presence of a liquid in close proximity to said electrode... | 07/04/1978 |
| 4083038 | Condenser plate assembly A sensor and alarm device for sensing the level of a liquid in a non-conductive container, the device including a condenser plate assembly to be secured to the container for capacitive coupling to its liquid contents and further including an electronic ca... | 04/04/1978 |
| 4064753 | RF admittance measuring method and apparatus for determining the level of a conductive liquid Various probes which are adapted to measure the liquid level in a vessel including the flow rate through a channel comprise a conductive probe electrode and guard electrode means including a rear portion located between the wall of the vessel and the prob... | 12/27/1977 |
| 4021707 | Compensated probe for capacitive level measurement A capacitive probe for measuring fluid level has two electrodes, each of which forms a capacitor with a supporting conductive body. The first electrode is a vertical band which will yield a capacitive value dependent upon the dielectric constant, conducti... | 05/03/1977 |
| 4014598 | Component cabinet A free standing component cabinet capable of being rapidly reconverted to allow rack mounting thereof. The cabinet comprises a frame normally used for rack mounting which frame includes front rear and side walls and front mounting flanges having holes the... | 03/29/1977 |
| 4003259 | Method and a device for capacitive level measurement Capacitive level measurement apparatus comprising two sets of interdigitated capacitive elements arranged along the vertical direction for immersion in a liquid or the like, and a switch arrangement with external connections which provide sequential measu... | 01/18/1977 |
| 3958159 | Capacitance probe and system for precision measurement of liquid level The capacitance probe consists of a vertical insulated wire stretched taut in the tank, or other container, where liquid level is to be measured. Fittings at the top and bottom conveniently and efficiently support and tighten the wire. The system comprise... | 05/18/1976 |
| 3950653 | Instrument for sensing level of granular materials A cylindrical housing contains both a circuit board and a pair of capacitive sensing electrodes. The pair of electrodes are adjacent the inside wall near an end that is to be wholly or partly covered with granular material in a container. Since an electri... | 04/13/1976 |
| 3948359 | Vehicle hydraulic shock absorber and indicating system A vehicle shock absorber and indicating system including a hydraulic shock absorber having two electrically conductive, relatively movable portions which are electrically insulated from one another to form a capacitor whose capacitance changes with changi... | 04/06/1976 |
