Having Electrical Indication Patents (Class 374/188)
  • Patent number: 11682812
    Abstract: A method includes stacking unit cells in a stacking direction. Each unit cell includes an electrode structure, a separator structure, and a counter-electrode structure. The electrode structure includes an electrode current collector and an electrode active material layer, and the counter-electrode structure includes a counter-electrode current collector and a counter-electrode active material layer. The electrode and counter-electrode structures extend in a longitudinal direction perpendicular to the stacking direction, and an end portion of the electrode current collector extends past the electrode active material and the separator structure in the longitudinal direction.
    Type: Grant
    Filed: March 31, 2022
    Date of Patent: June 20, 2023
    Assignee: Enovix Corporation
    Inventors: Michael J. Armstrong, Daniel J. Noelle, Robert S. Busacca, Bruno A. Valdes, Robert K. Rosen, Murali Ramasubramanian, Ashok Lahiri, Robert M. Spotnitz
  • Patent number: 11008215
    Abstract: A complementary metal-oxide-semiconductor (CMOS) micro electro-mechanical system (MEMS) microphone and a method for fabricating the same are disclosed. Firstly, a CMOS device including a semiconductor substrate, a first oxide insulation layer, a doped polysilicon layer, a second oxide insulation layer, a patterned polysilicon layer, and a metal wiring layer from bottom to top. The metal wiring layer is formed on the second oxide insulation layer. The patterned polysilicon layer includes undoped polysilicon. Then, a part of the metal wiring layer is removed to form a metal electrode and the semiconductor substrate is penetrated to have a chamber and expose the first oxide insulation layer, thereby forming a MEMS microphone.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: May 18, 2021
    Inventor: Chuan-Wei Wang
  • Patent number: 8899829
    Abstract: A temperature-sensitive label is described. The temperature-sensitive label has a temperature-sensitive system having a filiform shape memory member that has a first end portion having a terminal part fixedly secured to a first contact member, a second end portion having a terminal part restrained by a second contact member in a non-permanent way, and a central curved portion. The central curved portion is in the martensitic phase while the first and second portions are in the austenitic phase at a same environmental temperature above a critical threshold temperature to be monitored by the label such that in case of exposure to a temperature lower than the preset critical threshold temperature the end portions of the filiform shape member perform a phase transition, from austenitic phase to martensitic phase, which causes its irreversible disengagement from the restraint formed by the second contact member.
    Type: Grant
    Filed: February 20, 2013
    Date of Patent: December 2, 2014
    Assignee: SAES Getters S.p.A.
    Inventors: Francesco Butera, Stefano Alacqua, Luca Fumagalli
  • Publication number: 20140334526
    Abstract: A temperature-sensitive label is described. The temperature-sensitive label has a temperature-sensitive system having a filiform shape memory member that has a first end portion having a terminal part fixedly secured to a first contact member, a second end portion having a terminal part restrained by a second contact member in a non-permanent way, and a central curved portion. The central curved portion is in the martensitic phase while the first and second portions are in the austenitic phase at a same environmental temperature above a critical threshold temperature to be monitored by the label such that in case of exposure to a temperature lower than the preset critical threshold temperature the end portions of the filiform shape member perform a phase transition, from austenitic phase to martensitic phase, which causes its irreversible disengagement from the restraint formed by the second contact member.
    Type: Application
    Filed: February 20, 2013
    Publication date: November 13, 2014
    Inventors: Francesco Butera, Stefano Alacqua, Luca Fumagalli
  • Publication number: 20140177675
    Abstract: A temperature sensing system comprises a conductive tube, a shape memory alloy (SMA) element, and a detector. The SMA element is disposed to create an electrical contact with the electrical tube when subjected to at least a critical temperature, and the detector is configured to identify an alarm condition when the conductive tube and the SMA element form a closed electrical circuit.
    Type: Application
    Filed: December 20, 2013
    Publication date: June 26, 2014
    Applicant: Kidde Technologies, Inc.
    Inventors: Paul Rennie, Beth A. Dutson, Paul D. Smith, Robert G. Dunster
  • Patent number: 8500034
    Abstract: An integrated solid-state temperature controller that is mountable to an object the temperature of which is controlled by the solid-state temperature controller, or is mountable in a space in which the temperature is controlled by the solid-state temperature controller. The solid-state temperature controller able to withstand and continue to operate in extremes of temperatures at which the object or space is controlled, and able to withstand and continue to operate in extremes of temperatures of the object or space when the temperature is not being controlled.
    Type: Grant
    Filed: September 30, 2009
    Date of Patent: August 6, 2013
    Assignee: Engenity LLC
    Inventor: Richard S. Garber
  • Publication number: 20120211684
    Abstract: A detector (3) is provided that is independent of outside energy, for a release device, for which detector no battery and no external power supply is provided, and that generates a signal at a defined temperature, a thermal release element (3.2), at least one piezo element (3.1) and a coupling element (11) being arranged such in a bracket/housing (3.3) that as a result of a change in state of the thermal release element (3.2) by the coupling element (11) exerts a mechanical pressure on the piezo element (3.1) so that an electric signal is generated. A valve for a release device is also provided.
    Type: Application
    Filed: February 16, 2012
    Publication date: August 23, 2012
    Applicant: MINIMAX GMBH & CO. KG
    Inventor: Chrysafis Zlatintsis
  • Publication number: 20120076172
    Abstract: The present invention provides a micro-electro-mechanical-system (MEMS) temperature sensor that employs a suspended spiral comprising a material with a positive coefficient of thermal expansion. The thermal expansion of the suspended spiral is guided to by a set of guideposts to provide a linear movement of the free end of the suspended spiral, which is converted to an electrical signal by a set of conductive rotor azimuthal fins that are interdigitated with a set of conductive stator azimuthal fins by measuring the amount of capacitive coupling therebetween. Real time temperature may thus be measured through the in-situ measurement of the capacitive coupling. Optionally, the MEMS temperature sensor may have a ratchet and a pawl to enable ex-situ measurement.
    Type: Application
    Filed: September 28, 2010
    Publication date: March 29, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Jason P. Gill, David L. Harmon, Timothy D. Sullivan
  • Publication number: 20110044373
    Abstract: A fiber-optic temperature sensor with a cantilever beam including two different material strips with different thermal expansion coefficients, the cantilever beam having a reflective surface on an end of the cantilever beam, an optical fiber probe including a transmitting multimode optical fiber and at least one receiving multimode optical fiber for receiving reflected light from the reflective surface. Temperature changes at the sensor are indicated by a change in reflected light coupled into the receiving multimode optical fiber due to lateral displacement of the edge of the reflective surface caused by bending of the cantilever beam. Some embodiments have additional reference receiving fibers for compensation for noise, changes in gap length, and other factors.
    Type: Application
    Filed: February 2, 2010
    Publication date: February 24, 2011
    Applicant: The Government of the US, as represented by the Secretary fo the Navy
    Inventors: Nicholas Lagakos, Joseph A. Bucaro
  • Patent number: 7604398
    Abstract: Cumulative thermal exposures monitors and remote indicating cumulative thermal exposure monitors and system for reading the same are disclosed. The monitors have a thermally insulative housing with a cavity and a thermally-responsive member therein formed of shape memory material, which may be provided with a coating or sheath of insulative or shape memory polymer material, that gradually changes from a first shape to a second shape over a prescribed temperature range wherein the thermal capacity and insulative properties of the housing, cavity, and shape memory material transition temperature range are correlated relative to one another and calibrated to closely match a thermal decay profile (time-temperature profile) of the product being monitored. In remote indicating embodiments, the data can be retrieved remotely via RF transponder technology without directly viewing the monitor device.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: October 20, 2009
    Inventors: Jeffrey W. Akers, Gerald A. Coles, James Michael Zerkus
  • Patent number: 7557721
    Abstract: The thermal detection and visual alarm unit includes a plurality of first expansion thermal detectors (17) with normally closed contacts that are connected in series with a first lamp (15) to form a first two-terminal circuit (21, 23), a plurality of second expansion thermal detectors (18) with normally open contacts connected in parallel, a second lamp (16) connected in series with the second thermal detectors to form a second two-terminal circuit (22, 24), the first and second thermal detectors forming a plurality of cells (19) each combining a first detector and a second detector having respective contact-opening or contact-closing temperatures that are substantially equal, each of the first and second two-terminal circuits being arranged for connection to the terminals of an electrical power supply (12).
    Type: Grant
    Filed: November 28, 2006
    Date of Patent: July 7, 2009
    Assignee: Eurocopter
    Inventor: Daniel Chaniot
  • Publication number: 20090117269
    Abstract: An electrically conductive composite material includes metallic nanostrands distributed throughout a matrix constructed of a polymer, ceramic, or elastomer. The nanostrands may have an average diameter under four microns and an average aspect ratio over ten-to-one. Larger fibers may also be included to enhance electrical conductivity or other properties. The nanostrands and/or fibers may be magnetically oriented to enhance electrical conductivity along one direction. A pressure sensor may be formed by utilizing an elastomer for the matrix. Electrical conductivity through the composite material varies in proportion to deflection of the elastomer. A composite material may be applied to a surface as an electrically conductive paint. Composite materials may be made by cutting a blank of the nanostrands to the desired shape, inserting the matrix, and curing the matrix. Alternatively, a suspension agent may first be used to dispose powdered nanostrands in the desired shape.
    Type: Application
    Filed: December 11, 2006
    Publication date: May 7, 2009
    Applicant: Metal Matrix Composites Company
    Inventors: George Clayton Hansen, Lauren Hansen, William C. Jenkin
  • Publication number: 20080025373
    Abstract: A temperature detecting device includes a heat receiving plate, a displacement transmitting part, a deforming part, a deformation generating part and a displacement detecting part. The heat receiving plate is restrained at its rim portion to generate a displacement of a central portion in its thickness direction with respect to the rim portion in accordance with the temperature of an atmospheric gas. The displacement transmitting part is displaced in accordance with the displacement of the central portion of the heat receiving plate. The deforming part is deformed by the displacement transmitting part. The deformation generating part maintains a distance between the rim portion of the heat receiving plate and the deforming part. The displacement detecting part detects a deformation of the deforming part and outputs an electric signal.
    Type: Application
    Filed: April 17, 2007
    Publication date: January 31, 2008
    Applicant: DENSO CORPORATION
    Inventors: Inao Toyoda, Yukihiro Katoh
  • Publication number: 20040190593
    Abstract: A temperature measuring device includes a temperature-responsive element that mechanically moves a first inductive assembly component relative to a second inductive assembly component in response to temperature changes. The movement of the first inductive assembly component relative to the second inductive assembly component generates a change in a local eddy current pattern that corresponds to the sensed temperature.
    Type: Application
    Filed: August 26, 2003
    Publication date: September 30, 2004
    Inventors: Walter J. Ferguson, John H. Bailey
  • Patent number: 6769803
    Abstract: A calibration device for performing a temperature calibration of the temperature in an oven, especially an oven adapted for thermal treatment of a dental product, includes at least one metallic
    Type: Grant
    Filed: April 17, 2003
    Date of Patent: August 3, 2004
    Assignee: Ivoclar Vivadent AG
    Inventors: Heinrich Feichtinger, Rudolf Jussel
  • Patent number: 6617971
    Abstract: An alarm device for signaling when an object reaches a specified temperature. The alarm device includes a thermometer for detecting the temperature of the object. The device further includes a switch element which is closed when the thermometer indicates the specified temperature. The closed switch element triggers an alarm, such as a light or a buzzer, which will signal a person monitoring the temperature that the specified temperature has been reached.
    Type: Grant
    Filed: September 26, 2001
    Date of Patent: September 9, 2003
    Inventor: John Keller
  • Patent number: 6086249
    Abstract: The invention concerns a method to reproduce and display the winding temperature of an electric power transformer by deriving the measured and displayed temperature from the temperature of the coolant cooling the power transformer and the temperature of an electric heater fed with a current proportional to the load of the power transformer. A thermometer system is used for measuring the temperature and comprises of a hollow sensor element (7) and a mechanical transducer (2) connected through a capillary tube (6) with said element (7) to actuate a mechanical display and comprising several switches, the mutually connected cavities of sensor element (7), capillary tube (6) and transducer (2) subtending a closed pressure chamber filled with a test medium of which the pressure changes in relation to pressure.
    Type: Grant
    Filed: November 21, 1997
    Date of Patent: July 11, 2000
    Inventor: Manfred Urich
  • Patent number: 5816708
    Abstract: In the thermometer of the present invention a hollow sensing element (9) is connected by a capillary tube (18) to the hollow space of a Bourdon spring (19). The hollow sensing element (9), the capillary tube (18) and the mechanical measuring unit are filled with a substance whose pressure varies with temperature thus causing the Bourdon spring (19) to actuate a mechanical indicating device (5, 6). The capillary tube (18) or the hollow space of the mechanical measuring unit (2) has connected thereto an electric measuring unit (3) which comprises a measuring chamber (15) enclosed by a rigid casing (12), an electric pressure measuring cell (16) bounding the measuring chamber (16), and an electric measuring transducer (4) connected to the pressure measuring cell (16) for generating a transmittable signal.
    Type: Grant
    Filed: February 24, 1997
    Date of Patent: October 6, 1998
    Inventor: Manfred Urich
  • Patent number: 5772327
    Abstract: For measuring and controlling the temperature of a splice portion between two optical fiber (1, 1') ends, during the splicing process when the material of the ends is heated to be fusioned, the time-dependency of the surface tension effect for viscous liquids is utilized. Then the fiber (1, 1') ends are placed for splicing with a relatively large lateral offset in the retainers (39) of a fiber splicer and are spliced by the heat of an electric arc generated between the welding electrodes (43). The heating of the fiber ends is continued, whereby the offset of the fiber ends will gradually decrease due to the surface tension. The offset is then measured at different times during the continued heating and from these determined values and the times when they were measured the temperature of the heated fiber end portions is determined. This temperature value may then be compared to a predetermined set value for control of the heating of the splice region.
    Type: Grant
    Filed: April 26, 1996
    Date of Patent: June 30, 1998
    Assignee: Telefonaktiebolaget LM Ericsson
    Inventor: Wenxin Zheng
  • Patent number: 5680107
    Abstract: Thermally induced movement between stacked conical, pyramidal "cones" and segments of such cones can be used to provide alarm signals and control the distance between and orientation of objects. Preferably, each of the stacked cones must have a lesser characteristic of thermal change than the cone next most proximate to the base cone.
    Type: Grant
    Filed: October 7, 1994
    Date of Patent: October 21, 1997
    Inventor: Yoram Curiel
  • Patent number: 5366292
    Abstract: For use in a measuring and analysis instrument, a sensor including a sensor element responsive to changes in a quantity to be measured by the instrument. The sensor element is formed from a deformation heat-recoverable material having a predetermined range of temperatures in which recovery occurs. The sensor may include a control mechanism for maintaining the temperature of the sensor element substantially within the predetermined range. The sensor element forms a part of a circuit including a power source, and the control mechanism may include apparatus for selectively heating the sensor element. The sensor element is operatively connected to a signal device for sensing a physical characteristic of the sensor element and generating signals corresponding to the characteristic sensed. The signal device may include a temperature sensor, a force sensor, or a light sensor.
    Type: Grant
    Filed: February 1, 1990
    Date of Patent: November 22, 1994
    Assignee: Leybold AG
    Inventor: Guenter Voss
  • Patent number: 5255981
    Abstract: A temperature sensor has a body whose thermal expansion is evaluated in the event of a change in temperature, there being deposited on the body a layer which has a layer structure containing less than 8% by weight of phosphorus, preferably containing up to 3% by weight of phosphorus, up to 2% by weight of an element of main group IV or main group V, in particular antimony, and up to 5% by weight of a transition metal element, in particular cobalt. The percentages by weight resulting from the sum being increased up to 100% with nickel. The layer modifies the magnetic flux in a coil arrangement comprising at least one coil. This change in the magnetic flux in the coil arrangement is evaluated and the change in the magnetic flux being detected as a change in the inductance. The change in length of the body and the change in temperature are deduced therefrom.
    Type: Grant
    Filed: January 29, 1993
    Date of Patent: October 26, 1993
    Assignee: Mercedes-Benz AG
    Inventors: Edmund Schiessle, Khaldoun Alasafi, Ralf Gutohrlein
  • Patent number: 5207766
    Abstract: Vibrations of a body are measured by attaching a vibrating element to the body, directing a beam of electromagnetic energy onto the vibrating element and collecting reflected electromagnetic energy from the vibrating element. The magnitude of the reflected electromagnetic energy is processed to determine vibration and/or temperature of the body. The magnitude of the reflected light is preferably a function of second degree of the position of said vibrating element. Processing said magnitude of reflected electromagnetic energy is preferably done by a Fourier series up to a second harmonic.
    Type: Grant
    Filed: July 31, 1991
    Date of Patent: May 4, 1993
    Assignee: Consiglio Nazionale Delle Ricerche
    Inventors: Giuliano Conforti, Andrea A. Mencaglia, Mario Brenci, Anna G. Mignani
  • Patent number: 4929090
    Abstract: A temperature indicating label includes a rectangular, insulative panel scribed on its faces with intersecting grooves in which electrodes of a galvanic reaction are bedded. One of the electrode sets is consumed in the course of electrolytic reaction and when consumed will expose the electrolyte admixed with a dye. A switching circuit selectively steps in sequence across the consummable electrodes while another portion of the circuit selects the other electrodes in accordance with temperature.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: May 29, 1990
    Inventor: Isabelle Grahm
  • Patent number: 4893945
    Abstract: A temperature sensor having a heat sensing portion including silicone rubber having thermal expansion and contraction characteristics which are linear with respect to changes in temperature, and a responsively operating portion adapted to operate by thermal expansion and contraction of the silicone rubber. The silicone rubber expands as the ambient temperature around the heat sensing portion rises, and the silicone rubber contracts as the ambient temperature decreases. The operating portion operates in response to this expansion or contraction, thereby detecting the temperature change.
    Type: Grant
    Filed: July 10, 1987
    Date of Patent: January 16, 1990
    Assignee: Nibex Co., Ltd.
    Inventors: Teruo Okano, Tomomi Nagata
  • Patent number: 4699519
    Abstract: A grain temperature monitor for use with one or more grain bins, the monitor including one or more temperature sensors, an analog sensor indicator unit, and a non-analog sensor indicator unit. The analog sensor indicator unit provides a signal when one or more of the temperature sensors senses a temperature in the monitored grain that equals or exceeds a predetermined reference temperature. In addition, an operator controllable switch can be manipulated to determine the approximate temperature of the highest sensed temperature. The non-analog sensor indicator unit provides a visual indication as to which of the temperature sensors then currently senses the highest temperature, without regard as to whether such sensed temperature exceeds the predetermined temperature threshold or not.
    Type: Grant
    Filed: June 24, 1986
    Date of Patent: October 13, 1987
    Assignee: Performance Technology, Inc.
    Inventor: Gleelynn W. Persson
  • Patent number: 4690570
    Abstract: A C-shaped failure detector for steam traps includes a curved temperature sensitive bi-metal strip positionable against the external surface of a steam or condensate pipe, and two thermally insulative arms, one extending from each end of the strip. The contiguous surface area between the bi-metal strip and pipe varies with the pipe surface temperature, resulting in an amplified response, both in expansion and contraction. A threaded rod is pivotally mounted to one of the arms, and a sleeve threadedly engages the free end of the rod and extends freely through an opening in the other arm. The sleeve is rotated on the rod to selectively position the sleeve with respect to the second arm. The arms move angularly toward or away from each other responsive to temperature changes in the bi-metal strip.
    Type: Grant
    Filed: May 19, 1986
    Date of Patent: September 1, 1987
    Inventor: Donald W. Wall
  • Patent number: 4586383
    Abstract: A pressure gauge includes a cylindrical member having a flexible plate covering one end. Center flex of the plate is used to measure the force applied by fluid pressure. A low pressure transducer electrically measures the applied force. Pressure is transmitted from the flexible plate to the transducer by hydraulic fluid enclosed in the cylinder by a plastic boot. The boot is sealed to the cylinder by a sweat fit between the cylinder and a coaxial collar. The range of forces that can be measured is controlled by the thickness and diameter of the plate. In addition to pressure, the gauge can be used to measure temperature and orifice opening, and provide an indication of volumetric flow of the fluid.
    Type: Grant
    Filed: September 13, 1982
    Date of Patent: May 6, 1986
    Inventor: George W. Blomquist
  • Patent number: 4541735
    Abstract: A thermal sensing element containing a heat responsive material having a very high negative coefficient of thermal expansion. The heat responsive material contained therein is a methanol saturated copolymer of hexafluoropropylene and vinylidene fluoride. This thermal sensing element can detect minute temperature changes and can be packaged in a compact container for use in applications where space is limited.
    Type: Grant
    Filed: December 24, 1984
    Date of Patent: September 17, 1985
    Assignee: General Motors Corporation
    Inventor: Ismat A. Abu-Isa
  • Patent number: 4537518
    Abstract: A temperature sensing unit produces an output signal commensurate with temperature, the output signal serving as a basis for discriminating a temperature above a predetermined threshold temperature as well as a rising temperature gradient over a predetermined period of time. When means for effecting the discrimination operation senses both conditions, a temperature measuring unit begins measuring temperature on the basis of an input from the temperature sensing unit. When said measurement begins, the measuring unit raises the resolution of temperature information from the sensing unit.
    Type: Grant
    Filed: March 23, 1984
    Date of Patent: August 27, 1985
    Assignee: Terumo Kabushiki Kaisha
    Inventor: Masakazu Murase
  • Patent number: 4466295
    Abstract: Photoelastic sensing means, and more particularly photoelastic sensing means capable of providing high sensitivity for measuring pressure, force, displacement, acceleration or inertial force, proximity, temperature and other measurands. The photoelastic sensing means comprises a thin photoelastic member of transparent material having closely spaced top and bottom outer surfaces with peripheral edges and an edge surface extending between the peripheral edges of the other surfaces. Light flux is provided to the edge surface of the member at a first region for transmission by the member along a path to a second region at the edge surface where it is received and detected. The spacing between the top and bottom outer surfaces of the member is relatively small compared to the length of the path of the light flux in the member. The member is supported to produce bending stresses in the member in a direction transverse to the path of the light flux in the member with the application of force to the member.
    Type: Grant
    Filed: September 20, 1982
    Date of Patent: August 21, 1984
    Assignee: TRW Inc.
    Inventor: Laurence N. Wesson
  • Patent number: 4461584
    Abstract: A temperature sensing unit produces an output signal commensurate with temperature, the output signal serving as a basis for discriminating a temperature above a predetermined threshold temperature as well as a rising temperature gradient over a predetermined period of time. When a discriminator senses both conditions, a temperature measuring unit begins measuring temperature on the basis of an input from the temperature sensing unit. When the measurement begins, the measuring unit raises the resolution of temperature information from the sensing unit.
    Type: Grant
    Filed: September 15, 1982
    Date of Patent: July 24, 1984
    Assignee: Terumo Kabushiki Kaisha
    Inventor: Masakazu Murase
  • Patent number: 4444517
    Abstract: An electronic clinical thermometer which includes a temperature sensing element for sensing body temperature and converting the sensed body temperature into a corresponding electrical signal, a measuring unit for converting the electrical signal into a digital signal, an arithmetic unit for computing body temperature on the basis of the digital signal, a display unit for displaying the computed body temperature, a battery for supplying each of these loads with electric power, and a magnetic reed switch, having a break-type contact, connected between the battery and the load. The electronic clinical thermometer, in combination with a carrying case, includes a magnet which opens the switch contact of the magnetic reed relay when the thermometer is placed in the case.
    Type: Grant
    Filed: September 14, 1982
    Date of Patent: April 24, 1984
    Assignee: Terumo Kabushiki Kaisha
    Inventor: Masakazu Murase
  • Patent number: 4396301
    Abstract: A system for sensing or detecting changes in and accumulating data relating to variable quantities or conditions, for example temperature, is disclosed. In one instance, the system sensor is a mercury tube thermometer modified with conductors or contacts embedded in the glass walls of the mercury tube. As the temperature rises, the conductive material rises and performs a switching function with the embedded contacts closing an electrical circuit to which the contacts are connected. The circuit components include plurality of logic gates the inputs of which are connected to the switching contacts in a manner such that their outputs are singularly true in a sequence corresponding to the direction of temperature change. In another instance the sensor is a bimetallic strip, coil or thermal Bourdon tube and an arm or pointer needle mounted on an end of the strip or tube rotates in response to changes in the temperature being sensed.
    Type: Grant
    Filed: July 15, 1981
    Date of Patent: August 2, 1983
    Assignee: Thiokol Corporation
    Inventor: Alfred B. Stucki
  • Patent number: 4345471
    Abstract: A light source for forming an optical path extending across a closed vessel and a light receiving unit for receiving light from the light source are disposed outside the closed vessel. A portion to have its temperature measured as lies in the closed vessel is provided with a temperature detecting device which consists of a temperature sensor and a light interceptive plate. The temperature sensor is formed to be downwardly convex by sticking two members of different coefficients of thermal expansion one over the other (the member of the larger coefficient of thermal expansion being arranged over the member of the smaller coefficient of thermal expansion). The light interceptive plate is arranged over the member of the larger coefficient of thermal expansion. When the portion to have its temperature measured has reached a predetermined temperature, the temperature sensor inverts the downwardly convex state into an upwardly convex state.
    Type: Grant
    Filed: May 9, 1980
    Date of Patent: August 24, 1982
    Assignee: Hitachi, Ltd.
    Inventors: Fumihiro Endo, Toshio Ishikawa, Jun Ozawa, Yuzuru Kamata, Shigeo Shiono