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 |
| 7516670 | Multi-channel manometer with independent fluid level adjustments A manometer for multi-channel pressure measurement is presented which includes two or more manometer channels, where each channel includes an independent fluid level adjustment. Also included is a method for calibrating multiple channel carburetors using a manometer... | 04/14/2009 |
| 7140256 | Relative pressure sensor A pressure sensor for measuring a pressure difference between a pressure being measured and the ambient atmospheric pressure surrounding the pressure sensor, including a platform and a membrane loadable with a pressure being measured. The membrane is secured at its ... | 11/28/2006 |
| 7112177 | Apparatus for monitoring intra-abdominal pressure An apparatus for monitoring intra-abdominal pressure in a medical patient includes a urinary catheter connected to a urine valve having selectable communication positions between a discharge end of the urinary catheter and either a drain or a fluid source. Preferabl... | 09/26/2006 |
| 7077486 | Enclosure for handling hazardous material An enclosure for handling hazardous material includes a sealable housing which is configured with a first air inlet connected to a bubble gauge and a second air inlet disposed inside the housing for air evacuation from the housing is connected to a pump for maintain... | 07/18/2006 |
| 7062967 | Fuel level sensor An apparatus and method are provided for determining the fuel level in a fuel tank. The apparatus includes an acoustic transducer arranged to transmit an acoustic signal and receive a reflected signal. A float remains buoyant at the surface of the fuel in the tank a... | 06/20/2006 |
| 7047832 | Apparatus for measuring gas exchange A container having a port for holding a liquid medium and a reactant that interact to produce a change in gas levels within the container. A removable stopper for insertion into the port creating an airtight seal. A tube extending through the stopper into the contai... | 05/23/2006 |
| 6843121 | Measuring absolute static pressure at one or more positions along a microfluidic device A method of measuring absolute static pressure in a microfluidic device transporting a working fluid that is immiscible in a first selected gas environment, includes providing a first fluid conducting channel having an atmosphere provided by the first selected gas e... | 01/18/2005 |
| 6591696 | Integral electric pressure probe for aircraft An electric pressure probe for an aircraft comprises: a pitot tube assembly for collecting pneumatically air pressure in the vicinity of the assembly; a strut including one end mountable to a surface of the aircraft, the pitot tube assembly being coupled ... | 07/15/2003 |
| 6575026 | Measuring absolute static pressure at one or more positions along a microfluidic device A method of measuring absolute static pressure at one or more positions along the wall of a microfluidic device transporting a working fluid that is immiscible in a first selected gas environment, includes providing a first fluid conducting channel having... | 06/10/2003 |
| 6510741 | Manometer having dual pressure sensors A manometer for measuring fluid pressure having a first pressure sensor and a second pressure sensor that is inverted with respect to the first pressure sensor. The first pressure sensor generates a first electrical output signal corresponding to a fluid ... | 01/28/2003 |
| 6487905 | Method and apparatus for detecting molten metal level in container for melting metallic material Upward variations of a molten metal level in a container for melting metallic material shall be carried out by detecting variations of a liquid level inside a detector connected to a gas-pipeline, wherein a rise in the pipeline pressure causes the liquid ... | 12/03/2002 |
| 5895862 | Manometer A dual-action disconnect valve mechanism for a double column manometer that simultaneously disconnects both tubes of the manometer from external pressure regions or sources, and a fluid displacement reservoir conveniently adjustable for varying the device... | 04/20/1999 |
| 5754609 | Condensation vessel for the measurement of steam pressure, filling level and steam flow rate and method for operating a condensation vessel A condensation vessel for the measurement of steam pressure includes a steam zone, a steam line which opens in the steam zone at an entrance, a condensate zone which is directly adjacent the steam zone and geodetically below the entrance, and a discharge ... | 05/19/1998 |
| 5609060 | Multiple channel perfused manometry apparatus and a method of operation of such a device An apparatus for multiple channel perfused gastrointestinal manometry particularly useful for animals and small children which avoids errors in pressure measurement due to air bubbles, particularly micro- bubbles in the channels. Achieved by the use of a ... | 03/11/1997 |
| 5098384 | Pressure-compensated fluid administering apparatus Patient pressure monitoring systems require constant monitoring and adjustment by patient care specialists because of erroneous indications of changes in blood pressure readings which occur is such systems. The changes are due to errors produced by the se... | 03/24/1992 |
| 4779464 | Manometer A dual cistern manometer having a vertically extending manometer assembly is designed to reduce the temperature gradient along a vertical axis. The assembly is housed in a cylindrical chamber that is itself surrounded by an outer cylindrical enclosure. Th... | 10/25/1988 |
| 4685328 | Capillary viscometer A capillary viscometer in which the liquid meniscus is detected by sensing electrical resistance changes in hermetically sealed electrical resistors which are spaced apart at the two levels in the measuring tube in which the meniscus is to be detected. Th... | 08/11/1987 |
| 4685908 | Device for detecting increased pressure in pleural cavity A prebubble detector is provided for an underwater drainage apparatus. A series of sensors and detectors are disposed along the small arm of the underwater seal in a drainage device and means is provided for detecting the least degree of negativity reache... | 08/11/1987 |
| 4683756 | Low cost manometer A portable inexpensive manometer is realized by forming a housing assembly of two pivotable panels. The probe and a major portion of the tube are stored within the interior of the housing until the manometer is to be used. The measuring liquid is stored i... | 08/04/1987 |
| 4537079 | Multi-pressure manometer A relatively simple and compact apparatus is described for producing and/or monitoring a plurality of reference pressures wherein all the pressures must be precise and, especially, precisely related to each other. The apparatus includes a plurality of man... | 08/27/1985 |
| 4535634 | Manometer Manometer apparatus includes an elongated rigid channel-like frame for protectively enclosing a manometer tube. The frame is formed with a plurality of internal longitudinal slides for supporting a planar or curved scale, a scale adjust slider and a trans... | 08/20/1985 |
| 4455876 | Precision manometer gauge A precision manometer gauge which locates a zero height and a measured height of liquid using an open tube in communication with a reservoir adapted to receive the pressure to be measured. The open tube has a reference section carried on a positioning pla... | 06/26/1984 |
| 4454759 | Fuel gauge for locomotives A fuel gauge for locomotives comprises a block adapted for attachment to the locomotive fuel tank near the bottom thereof, preferably by connection with a tank drain plug. First and second chambers in the block are joined by a passage connecting the lower... | 06/19/1984 |
| 4416157 | Inclined manometer An inclined manometer particularly adapted for gauging the draft of a stove flue pipe is provided. The manometer is comprised of a pair of opposed open-ended legs mounted on a mounting plate. The legs are inclined at a relatively large angle from each oth... | 11/22/1983 |
| 4404855 | High sensitive micromanometer An instrument wherein the downwards or upwards displacement of menisci under the action of a pressure differential in a U-tube arrangement is magnified by a factor of 104 or more. This measurement precision is accomplished by determining the vo... | 09/20/1983 |
| 4386524 | Manometer type apparatus with improvement A manometer type instrument with an open leg above an indicator fluid. It is subject to immersion in a body of liquid, the change in level of which is to be measured. It includes an improvement which eliminates the formation of a capillary seal at the top... | 06/07/1983 |
| 4380173 | Roll-up type U-tube manometer A roll-up type U-tube manometer of the type disclosed in Dwyer U.S. Pat. No. 2,662,409, in which the manometer tubes are defined by a flexible elongate body that may be as long as ten feet or any desired length formed from a transparent flexible plastic m... | 04/19/1983 |
| 4299116 | Methods involving differential pressure determinations A method for measuring the density of a vapor includes continuously introducing the vapor into the inlet of a vertical zone at a rate sufficient to maintain the zone completely filled with the vapor, and measuring the pressure at the lower portion of the ... | 11/10/1981 |
| 4297889 | Roll-up type U-tube manometer A roll-up type U-tube manometer of the type disclosed in Dwyer U.S. Pat. No. 2,662,409, in which the manometer tubes are defined by a flexible elongate body formed from a transparent flexible plastic material that is shaped to define the basic manometer t... | 11/03/1981 |
| 4228689 | Pressure relief manometer An apparatus for measuring pressure having a reservoir at its base contaig a measuring fluid. Mounted on the reservoir is a uniquely constructed manometer and a side arm with a stopcock to contain fluid spillage when blowouts occur due to gas formations.... | 10/21/1980 |
| 4157043 | Maximum pressure manometer A manometer for recording maximum pressures from a liquid supply comprising, a closed air chamber, an elongated channel communicating with the supply adjacent a lower end of the channel and communicating with the chamber through an opening adjacent an upp... | 06/05/1979 |
| 4156570 | Apparatus and method for measuring white blood cell and platelet concentrations in blood An apparatus and method for measuring the linear extent and hence the concentration of several constituent blood cell types which are contained in the buffy coat of a centrifuged sample of anticoagulated blood.... | 05/29/1979 |
| 4112948 | Surgical drainage system with pressure indicator and enclosed source of liquid A surgical drainage system is provided for the drainage of fluid from a body cavity which comprises a collection chamber, a U-tube manometer having one arm in fluid communication with the inlet to the collection chamber and a closed chamber in fluid commu... | 09/12/1978 |
| 4095476 | Single scale U-type manometer A U-type manometer particularly designed for use in measuring the height of iquids of different densities held in containers which features a calibrated measuring tube, a reservoir of manometric liquid connected to the lower end of the calibrated measuring... | 06/20/1978 |
| 4072053 | Apparatus for indicating liquid level in a receptacle An indicating apparatus for enabling a motor car driver to read the crankcase oil level by depressing a diaphragm forming part of an indicating unit. The diaphragm then opens and closes connections between a measuring tube reaching down into the crankcase... | 02/07/1978 |
| 4026156 | Vertical displacement measuring apparatus Apparatus for measuring the vertical displacement between a remote point and a reference point. The apparatus comprises a pair of reservoirs, each having a liquid working fluid disposed therein, a differential pressure transducer and a hydraulic coupling ... | 05/31/1977 |
| 4001678 | Displacement metering with independent ancillary flow Displacement metering with two independently metered fluid flows comprises displacing fluid in laminar filament flow from a first chamber through a second chamber into a third chamber, the chambers being separated by a pair of spaced walls provided with c... | 01/04/1977 |
| 3977253 | Pool filter pressure gauge A gauge for a pool filter in which the gauge includes a housing mounted on top of the filter, the housing having an interior chamber which is fluid connected at the bottom to the upper interior of the filter. The removable top of the gauge housing support... | 08/31/1976 |
