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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 7360433 | Filter change indicator A fluid system pressure indicator is adapted for use in fluid systems having a filter element. The fluid system force indicator includes a housing partitioned to be exposed to the fluid system to provide transmission of a mechanical force between these partitioned e... | 04/22/2008 |
| 7197919 | User adjustable calibration feature for a tire pressure gauge The pressure gauge is designed for operative engagement with a gas pressurized system such as a pneumatic tire. It includes a housing having a pressurized gas inlet orifice and a cylindrical bore formed within the housing. A pressure reactive piston is slidably enga... | 04/03/2007 |
| 7007552 | Multi-channel pressure sensing apparatus A multi-channel pressure sensor module (10) for integration in a hydraulic/electrical control unit of a vehicular braking system is shown. A body or manifold (16) mounts a plurality of strain gauge sense element assemblies (12) each having a por... | 03/07/2006 |
| 7000483 | Inflatable manometers An inflatable air cell pressure transducer. The air cell has a concavity formed therein. The concavity has two edges, wherein increased pressure within the air cell causes contraction of the concavity moving the two edges closer. ... | 02/21/2006 |
| 6978670 | Tire valve-gauge combination A tire valve-gauge combination utilized to inflate and deflate conventional tubed or tubeless tires while giving the user an indication of the amount of air pressure within the tire's chamber. The accessory device of the present invention comprises; a flexible rim-a... | 12/27/2005 |
| 6736012 | Safety device for use as overpressure protection for a trapped volume space The invention is a safety device for a trapped volume space for use as overpressure protection made of a housing forming a chamber within a trapped volume space having a incompressible fluid, a compressible material disposed in the chamber, and a pressure relief com... | 05/18/2004 |
| 6718827 | Center-mount capacitive sensor with overload protection A capacitive sensor includes an elastic member extending about a central axis, having a central region, a peripheral region, a first side, and a second side. An overpressure stop member has an inner surface and an outer surface. The inner surface of the overpressure... | 04/13/2004 |
| 6543294 | Sealed pressure indicator A pressure indicator according to the present invention monitors the pressure of the fluid in a vessel. One embodiment of the present invention comprises a closed pressurized gas volume behind a dimpled metal diaphragm. In normal operation, the force of t... | 04/08/2003 |
| 6318181 | Multi-channel pressure sensor controller In a multi-channel pressure sensor controller, measured pressure signals from a plurality of pressure sensors to each of which a channel number is assigned are subjected to selection at a multiplexer using a selection signal based on the output of an arit... | 11/20/2001 |
| 5760693 | Vacuum apparatus for semiconductor device A vacuum controlling apparatus is provided. The vacuum level of a vacuum chamber can be accurately maintained by measuring and controlling the vacuum level of the vacuum chamber by using six parameters: desired pressure, predetermined time for reaching th... | 06/02/1998 |
| 5731523 | Hose fatigue indicator A hose fatigue indicator including a hose fitting defining an opening. A fracturable diaphragm is positioned adjacent the opening. The diaphragm is in communication with fluid flowing through the fitting. The diaphragm fractures upon exceeding a predeterm... | 03/24/1998 |
| 5612496 | Pressure gauge being capable of automatically stopping supply of pressure from a pressure source A pressure gauge includes a housing unit and a membrane which has a periphery secured to an inner wall of the housing unit, so as to define an air chamber under the membrane in the housing unit. The membrane has a central portion which can move upward in ... | 03/18/1997 |
| 5437188 | Tell tale device for a pressure vessel A post activation device to indicate that pressure the existed within a pressure vessel just prior to the opening of the pressure vessel and the resulting loss of pressurization, having a diaphragm, plug or piston (62, 130, 160, 330) capable of rupturing,... | 08/01/1995 |
| 4932264 | Microballoon tagged materials A technique for impregnating a fluid so that the impregnated fluid retains information about the highest pressure that has ever been exerted on it. This technique is particularly useful where normal pressure measurement methods are not practical.... | 06/12/1990 |
| 4881400 | Continuous measuring diaphragm pressure gage A mechanical pressure gage for measuring the change in fluid pressure resing from an explosive charge and the like. The sealed gage housing includes a plate member having a recess in which a metalic foil diaphragm means is frictionally mounted therein. T... | 11/21/1989 |
| 4776438 | Brake adjustment indicator A brake adjustment indicator adapted to be mounted to a mounting bracket which supports a brake air chamber on a surface of the mounting bracket opposite the brake air chamber with the brake air chamber having a rod extending therethrough with one end of ... | 10/11/1988 |
| 4748845 | Tire pressure gauge A tire pressure gauge located within a self-contained enclosure having a changeable numeric display at its exterior. An air inlet on the enclosure is utilized to establish pneumatic communication between the interior of an inflated tire and the interior o... | 06/07/1988 |
| 4716759 | Method of detecting cylinder pressure and cylinder pressure detection device in internal combustion engine A method of detecting cylinder pressure and a cylinder pressure detection device in an internal combustion engine. Two reference values are set and then adjusted so that the maximum pressure value output by a cylinder pressure sensor falls between them. A... | 01/05/1988 |
| 4715222 | Pressure gauge A pressure gauge includes a housing, an indicating board, a rotatable axle with a pinion member, an indicator for displaying the degree of rotation of the axle, a tube member disposed on the housing and having an air inlet, a movable member sealingly disp... | 12/29/1987 |
| 4715231 | Maximum pressure indicator A maximum pressure indicator for indicating maximum pressure of a fluid system employs a deformable disc which is bonded to a main plug. The plug has a cavity which is sealed by the disc so that a low pressure is maintained in the cavity. The indicator is... | 12/29/1987 |
| 4711119 | Peak combustion pressure signal processing circuit with diagnostic capability A peak combustion pressure signal processing circuit for an internal combustion engine having a plurality of combustion chambers with combustion pressure sensors includes an operational amplifier for each sensor with an output connected through a diode to... | 12/08/1987 |
| 4453411 | Pressure memory device A pressure memory device is used in conjunction with a pressure gauge to measure the highest or lowest liquid pressure in a system and to retain that measurement. The device comprises a manifold having a through bore with a check valve disposed therein. B... | 06/12/1984 |
| 4369728 | Air filter restriction indicating device An improved air filter restriction indicating device is disclosed for use in connection with an internal combustion engine intake air filtration system. The improvement resides in a novel structure for resetting the indicating device which permits the ind... | 01/25/1983 |
| 4280362 | Peak reading bottom hole pressure instrument A simplified downhole pressure reading instrument. It has a cylindrical body which holds a charge of gas at one end. There is a concentric cylindrical element which slides longitudinally inside the body with a low friction seal between them. The body has ... | 07/28/1981 |
| 4279214 | Brake wear indicator There is disclosed a brake wear indicator which is suited for the retrofit installation on vehicle pneumatic brakes. The wear indicator comprises a sleeve that loosely fits over the push rod of the pneumatic actuator. The sleeve has an outside diameter pe... | 07/21/1981 |
| 4254731 | Filter restriction indicator An indicator device for indicating when a prechosen pressure difference has been exceeded comprises a casing having two ports separated by a resilient diaphragm with an aperture therein, and a movable member urged into sealing relation with said aperture ... | 03/10/1981 |
| 4208048 | Punching bag including power gauge Apparatus for use in developing boxing technique to indicate punching power during work-outs with practice equipment, includes a practice bag or the like having a punch-receiving area including pneumatic structure with connection through a releasible chec... | 06/17/1980 |
| 4198869 | Apparatus for permanently indicating maximum gas pressure in a system An improved apparatus for measuring the maximum pressure of gas in a system by use of the Brinell principle. In preferred form, the apparatus of the invention is mounted in a plug fitting in the end of a steel cylinder for transporting gases under pressur... | 04/22/1980 |
| 4196690 | Device for indicating the maximum reading of a measuring instrument A device for indicating the maximum reading of a measuring instrument of the type having a needle turnable over a dial marked with a graduated scale extending for more than 360° includes an auxiliary needle mounted on a pivot pin carried by a transparent... | 04/08/1980 |
| 4184376 | Pressure sensitive indicating device A device (10) for metering discrete lengths of filament utilized in a flexible filament vegetation cutting device is disclosed. The line metering device (10) is preferably used in flexible filament lawn mowers. An electric motor (28) rotatively drives a d... | 01/22/1980 |
| 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 |
| 4111057 | Dual-indicator manometer for an electromedical device A dual-indicator manometer for an automatic sphygmomanometer, composed of two pressure indicators each mounted on a shaft and arranged to be individually blocked or released by the armature of an individual electromagnet. Depending on the excitation state... | 09/05/1978 |
| 4108428 | Portable punch power gage Apparatus for use in developing boxing technique to indicate punching power during work-outs with practice equipment, includes a practice bag or the like having a punch-receiving area including pneumatic structure with connection through a releasible chec... | 08/22/1978 |
| 4060050 | Fill indicator for a vacuum cleaner dust collector An indicator device mounted on a vacuum cleaner housing which is under the influence of the pressure differnce between the inlet and outlet of a dust or dirt collector unit of the vacuum cleaner. The outer surface of the indicator device has markings that... | 11/29/1977 |
| 3999430 | Dial tire pressure gage A dial pressure gage having a back-check valve with hand-operated pressure-relief control for maintaining readout on the gage for as long as desired combined with a length of flexible hose and quick-disconnect coupler for easy adaptation to and remote sen... | 12/28/1976 |
| 3983748 | Pickup for measuring the maximum pressure in internal combustion engine cylinder According to the invention a pickup for measuring the maximum pressure in the internal combustion engine cylinder comprises a spring-loaded reversing valve mounted in a housing and being in contact with the first seat made in the housing on the side of th... | 10/05/1976 |
| 3943768 | Method and apparatus for measuring peak pressure in fluids The pressure of a fluid is applied to an elongated resiliently yieldable element in direction transverse to the elongation thereof, so as to obtain a yielding of the element which is proportional to the fluid pressure. The degree of deflection is measured... | 03/16/1976 |
