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 |
| 7337674 | Pressure detector for fluid circuits A pressure measurement device usable for monitoring pressure of fluids such as blood, waste, and replacement fluid in a blood treatment system provides a reliable signal and other benefits by virtue of a number of features of the various embodiments disclosed. The p... | 03/04/2008 |
| 7249516 | Method of operating a resistive heat-loss pressure sensor In a resistively heated heat-loss pressure gauge, electrical current is switched between a sensing element and a compensating element at different duty cycles. As a result, the sensing element is heated relative to the compensating element. A fixed resistance is pla... | 07/31/2007 |
| 7240558 | Pressure sensor A pressure sensor for sensing a pressure level of a pressurized medium. The pressure sensor includes a housing that has a high pressure side, a low pressure side and an aperture. A substrate is located in the aperture. The substrate has a pair of ends and a center p... | 07/10/2007 |
| 7239246 | System and method for detecting water leakage A 3D liquid detection sensor, liquid-sensitive building material, and liquid detection systems have been provided. The 3D sensor comprises a 3D liquid detection field and an electrical connector to supply a resistance measurement responsive to liquid in the detectio... | 07/03/2007 |
| 6799468 | Apparatus and methods for heat loss pressure measurement A heat loss gauge for measuring gas pressure in an environment includes a resistive sensing element and a resistive compensating element. The resistive compensating element is in circuit with the sensing element and has temperature response and physical characterist... | 10/05/2004 |
| 6718829 | Semiconductor pressure sensor and an exhaust system including the same The full bridge circuit in a pressure sensor including semiconductor piezoelectric resistive elements in a pressure detection structure is connected to a filter. That is, first and second output terminals of the full bridge circuit is connected to a capacitor. One e... | 04/13/2004 |
| 6658941 | Apparatus and methods for heat loss pressure measurement A heat loss gauge for measuring gas pressure in an environment includes a resistive sensing element and a resistive compensating element. The resistive compensating element is in circuit with the sensing element and has temperature response and physical c... | 12/09/2003 |
| 6152181 | Microdevices based on surface tension and wettability that function as sensors, actuators, and other devices Microdevices based on surface tension and wettability are useful as sensors, detectors, actuators, pumps, among other applications. As sensors and detectors they can respond to numerous stimuli such as pressure, temperature, gravity, rotation, acceleratio... | 11/28/2000 |
| 5499533 | Downhole pressure gauge converter The apparatus disclosed is a type of downhole pressure gauge to be used to measure and record pressure information about oil and gas wells. The apparatus measures fluctuations in pressure by means of a mechanical pressure sensitive device, such as a Bourd... | 03/19/1996 |
| 5349866 | Digital pressure gauge A digital pressure gauge includes a casing having a pressure sensitive member which responds when pressure is passed therethrough and a digital display member electrically connected to the pressure sensing member. The gauge includes an insulating rod whic... | 09/27/1994 |
| 4718279 | Dual bourdon tube type sensing pressure transducer A pressure transducer in the nature of a differential pressure transmitter including an instrument housing defining a chamber in which is mounted a sensing transducer one of several known types powered to provide a gauge signal that is to be supplied to i... | 01/12/1988 |
| 4408484 | Temperature compensated gauge for pressurized gas such as natural gas fuel for vehicles A temperature compensated gauge for measuring and indicating the quantity of a gas within a pressurized system is provided, which, in addition to achieving a degree of accuracy appropriate for most practical applications, is characterized by qualities of ... | 10/11/1983 |
| 4207766 | Attitude compensating liquid content indicator A liquid container is provided with paired variable resistors fluidly connected to the container at opposite ends of the bottom thereof. The resistors are electrically interconnected in series, and the output comprising the sum of the resistances is direc... | 06/17/1980 |
| 3992945 | Bourdon pressure gauge having direct-coupled electronic and visual readout A Bourdon pressure gauge is provided with a direct-coupled electronic and visual readout. Specifically, the electronic and visual readouts are direct-coupled in that they are taken along a common linkage from the Bourdon tube. In addition, they are of com... | 11/23/1976 |
