Did You Know...
...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7752993 | Method and apparatus for a gauge for indicating a pressure of a fluid The invention relates to a method and apparatus for a gauge for indicating a pressure of a fluid, including a gauge having a face where the face has a first plurality of graduation marks, each for indicating a pressure in an ascending direction. The face also has a ... | 07/13/2010 |
| 7387080 | Pneumatic actuator movement indicator Disclosed is a pneumatic actuator movement indicator comprising a housing adapted to be connected in series between a pneumatic actuator and a source of pressurized fluid for the actuator, and an indicator located in, and having an equilibrium position in, the housi... | 06/17/2008 |
| 7182864 | Housing for environmentally friendly filter cartridge A filter system in which a housing and an environmentally friendly filter cartridge are coordinated to provide ease of change of the filter cartridge and reliable operation. The cartridge contains no metal parts and is readily incinerateable. The housing is provided... | 02/27/2007 |
| 6962126 | Automatic rising caution flag An automatic rising flag assembly includes a bracket connected to a water vessel and an elongated flagpole. The assembly further includes a mechanism connected to the water vessel and the bracket so that the flagpole can be pivoted and maintained between up and down... | 11/08/2005 |
| 6755148 | Dual magnetic register for a utility meter The present invention provides a device, system, and method for detecting and measuring the bi-directional flow of a fluid through a fluid meter, such as a household or business water meter. In one device embodiment the invention comprises a logical switch collar ( | 06/29/2004 |
| 6748897 | Fluid pressure equipment with position indicating mechanism A magnet is attached to a piston which slides in the interior of a casing due to action of fluid pressure, a guide groove is provided on a side face of the casing in a movement direction of the piston, an indicator is received in the guide groove, and at least one p... | 06/15/2004 |
| 6333689 | Apparatus and method for water flow fire alarm An apparatus and method for a flow-based fire alarm. A bypass system is provided to allow sufficient water flow where a pressure drop, particularly in a residential or multi-purpose piping system such as a water softener is encountered, by providing an al... | 12/25/2001 |
| 5693926 | Differential pressure indicators A double differential pressure indicator has a housing containing two pistons arranged in contiguous bores and biased by a single spring extending between opposed ends of the pistons. The differential pressure is applied across both pistons and as the pre... | 12/02/1997 |
| 5602373 | Differential pressure switch with an adjusting piston driven by a restoring spring for an oil-separating air filter A differential pressure switch particularly suitable for monitoring dirt accumulation on a filter element of an oil-separating air filter comprising a piston which is movable in response to a relative change in pressure between two pressure zones and is b... | 02/11/1997 |
| 5509622 | Protective cover, radiation shield and test unit for helicopter blade crack indicator A cover for a pressure sensor for indicating cracks in a hollow aircraft blade, the sensor having a shaft carrying a radiation source, with the shaft sliding in a housing between a first position with the radiation source within the housing and a second p... | 04/23/1996 |
| 5437241 | Differential pressure indicator A differential pressure indicator includes a housing having first and second pressure ports for fluid and a bore communicating with the pressure ports. A piston is movable in the bore between an actuated and an unactuated position in response to a pressur... | 08/01/1995 |
| 5299526 | Indicators A differential pressure indicator is of the type which uses a magentically attracted spring loaded pop-up button to indicate when the pressure difference between two fluids reaches a predetermined difference. In order to reduce or eliminate false readings... | 04/05/1994 |
| 5246571 | Clogging indicator for an aquarium filter A filter flow indicator for use with a filter bag into which contaminated aquarium water is pumped which comprises a meter tube connected to a inlet tube by an effective venturi connection. Water flowing in the inlet tube flows across the venturi connecti... | 09/21/1993 |
| 5237957 | Pressure indicator An essentially frictionless, reliable pressure indicator capable of withstanding high pressures is disclosed. The invention includes dual opposed springs, a pair of magnetic elements, and a resilient diaphragm abutting one of the magnetic elements. Use of... | 08/24/1993 |
| 5188728 | Clogging display with shape memory alloy spring actuator A fluid filter clogging display comprising a case of non-magnetic material divided into an upper housing, at atmospheric pressure, and a lower housing by an impermeable membrane, a piston movable in the lower housing and dividing the lower housing into a ... | 02/23/1993 |
| 4963857 | Translatable dual magnets A fluid flow detection device includes a fluid conduit, at least one magnet translatable by action of the flow of fluid (gas or liquid) in said conduit and a switch which is caused to change state between "on" and "off" relative to the position of the mag... | 10/16/1990 |
| 4867095 | Differential pressure indicator A cartridge style, pop up, differential pressure indicator includes a threaded body member, a cover structure and a cylindrical indicator button, which carries a magnet at its lower end, and is slidably supported in the cover for movement between a depres... | 09/19/1989 |
| 4858647 | Attitude-insensitive, by-pass sensor Disclosed is a valve having a body having an inlet channel, an outlet channel in fluid communication with the inlet channel, and a flow-monitoring region situated medially between the inlet and outlet channels. Further provided within the body is a second... | 08/22/1989 |
| 4836891 | Self-contained oil well salt water concentration system A method for concentrating salt water. Salt water is separated from oil-water mixture which has been produced from a well. Salt water is introduced into a recirculating weir and mixed with more concentrated brine. Brine is recirculated through a thermal s... | 06/06/1989 |
| 4747364 | Flow rate threshold sensor A flow rate sensor for use with an air filter channels air flow to energize an audible sound generator upon development of an air pressure differential within the sensor above a settable threshold, which pressure differential results from a reduction in t... | 05/31/1988 |
| 4745876 | Differential pressure responsive indicating device A temperature compensating differential pressure indicating device having a lock-out feature requiring internal reset after actuation. The differential pressure responsive indicating device includes a case having an internal chamber and a piston reciproca... | 05/24/1988 |
| 4729339 | Pressure differential indicator with non-mechanical thermal lockout An excessive pressure differential indicating device for use with a filter in a liquid circulating system. The device has a reciprocable piston that reciprocates between a high pressure location, when the pressure differential is not excessive, and a low ... | 03/08/1988 |
| 4669960 | Fluid pressure sensor An actual pressure of a fluid having an ambient pressure as part thereof is sensed by a sensor. When the actual pressure decreases below a predetermined pressure, a signal is produced. If desired, the sensor may cause production of the signal when the act... | 06/02/1987 |
| 4651670 | Pressure indicating device A device for indicating differential pressures between first and second pressure sources comprising a housing with a bore and a piston member slidably disposed within the bore and dividing the bore into first and second chambers. The piston member include... | 03/24/1987 |
| 4615303 | Fluid flow failure detection means A water flow failure detection device comprising a first water flow conduit; a second conduit with one end closed and the other end open communicating with the water flow conduit; positioned within the second conduit is a float which is free to translate ... | 10/07/1986 |
| 4574728 | Filter differential pressure impending and bypass indicator A differential pressure indicator for use with a filter providing dual indication to indicate both a bypass condition as well as an impending bypass condition. The indicator includes a pressure detector in the form of a piston carrying a pair of permanent... | 03/11/1986 |
| 4498495 | Magnetic differential pressure valve with an indicator showing when valve has opened or closed A magnetic differential pressure valve is provided, having an indicator showing when the valve has moved into one of the open and closed positions, comprising a housing including a valve seat; valve means reciprocably mounted in the housing for movement t... | 02/12/1985 |
| 4426952 | Temperature compensated differential pressure indicating device A differential pressure indicating device which is temperature compensated and includes a piston responsive to a pressure differential between inlet and outlet pressures. The piston is retained in a normal or first position by the force of a spring holdin... | 01/24/1984 |
| 4216672 | Apparatus for detecting and indicating the occurrence of a gas turbine engine compressor stall An apparatus for detecting and indicating the occurrence of a gas turbine engine stall operates by sensing sudden changes in a selected engine pressure. When a sudden large decrease in the selected engine pressure indicative of a stall is sensed, a visual... | 08/12/1980 |
| 4203384 | Magnetic pressure indicator with deactuator for bimetallic temperature-sensitive elements A magnetic differential pressure indicator is provided for detecting and indicating a pressure differential thereacross that is greater than a predetermined value in a fluid system, having a port that permits introduction or withdrawal of fluid for testin... | 05/20/1980 |
| 4172971 | Magnetic pressure indicator with thermal lockout A magnetic differential pressure indicator is provided for detecting and indicating a pressure differential thereacross that is greater than a predetermined value in a fluid system. A thermal lockout effective even at high internal fluid pressures prevent... | 10/30/1979 |
| 4130745 | Differential pressure threshold detector A differential pressure threshold detector in which a reed switch is arranged eccentrically in a housing which can be mounted on a housing containing an axially movable control magnet in either of two positions so that the axes of the reeds lie substantia... | 12/19/1978 |
| 4114558 | Measuring instrument indicating mechanism In a measuring instrument of the kind in which an axial movement of an input member is required to be converted into a rotary movement of an indicating member, such as a pointer movable across a scale, the input member acts against a cantilever mounted sp... | 09/19/1978 |
| 4090468 | Warning flag for vehicles Warning flag and associated releasing and raising mechanisms for emergency vehicles, water ski equipped boats and the like.... | 05/23/1978 |
| 4029042 | Differential pressure indicator device A differential pressure indicator includes an indicator element having a magnet affixed to the lower end thereof, the element being axially movable from a retracted non-indicating position to an extended indicating position. A spring-biased piston made of... | 06/14/1977 |
| 4026153 | Magnetic pressure indicator with sampling ports A magnetic differential pressure indicator is provided for detecting and indicating a pressure differential thereacross that is greater than a predetermined value in a fluid system. The sampling port permits withdrawal of fluid for examination without int... | 05/31/1977 |
| 4014284 | Differential pressure indicators A differential pressure indicator for indicating the degree of contamination of a filter element, has a piston movable against a spring by increasing differential pressure and the piston is connected through a helical constraint to turn a magnetic element... | 03/29/1977 |
| 4011759 | Differential pressure gauge A differential pressure gauge of the type comprising a controlling magnetic helix device carrying a pressure indicating arm, the position of which is controlled by a magnet mounted on the free end of a cantilevered leaf spring actuated by a pressure diaph... | 03/15/1977 |
| 3980040 | Differential pressure indicator A differential pressure indicator for indicating the state of a filter element comprises a magnetic piston slidable in a sleeve against a spring and subjected at its opposed faces to the pressures on each side of the filter element. A rod fixed to the pis... | 09/14/1976 |
| 3974795 | Differential pressure indicating device A differential pressure indicating device includes a piston responsive to the differential between inlet and outlet pressures. The piston is retained in a normal position by the force of spring means, and which spring means releases the piston at a predet... | 08/17/1976 |
