Source: http://www.google.com/patents/US7107178?dq=%22Meaning-based+advertising+and+document+relevance+determination%22
Timestamp: 2016-06-30 08:05:08
Document Index: 168363116

Matched Legal Cases: ['art 150', 'art 160', 'art 160', 'art 150', 'art 150', 'art 150', 'art 160', 'art 160', 'art 150', 'art 170', 'art 170', 'art 150', 'art 170', 'art 300', 'art 300', 'art 300', 'art 300', 'art 300']

Patent US7107178 - Temperature sensing circuit for use in semiconductor integrated circuit - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inPatentsA temperature sensing circuit has numerous trip points in conformity with a temperature change without adding decrease resistance branches, so as to obtain a fine control based on the temperature change. Accordingly, when employed in a semiconductor memory device, the temperature sensing circuit substantially...http://www.google.com/patents/US7107178?utm_source=gb-gplus-sharePatent US7107178 - Temperature sensing circuit for use in semiconductor integrated circuitAdvanced Patent SearchPublication numberUS7107178 B2Publication typeGrantApplication numberUS 10/942,776Publication dateSep 12, 2006Filing dateSep 17, 2004Priority dateOct 6, 2003Fee statusLapsedAlso published asDE102004049252A1, DE102004049252B4, US20050074051Publication number10942776, 942776, US 7107178 B2, US 7107178B2, US-B2-7107178, US7107178 B2, US7107178B2InventorsMyung-Gyoo Won, Jae-hoon Kim, Jong-wook ParkOriginal AssigneeSamsung Electronics Co., Ltd.Export CitationBiBTeX, EndNote, RefManPatent Citations (26), Referenced by (77), Classifications (13), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetTemperature sensing circuit for use in semiconductor integrated circuit
US 7107178 B2Abstract
A temperature sensing circuit has numerous trip points in conformity with a temperature change without adding decrease resistance branches, so as to obtain a fine control based on the temperature change. Accordingly, when employed in a semiconductor memory device, the temperature sensing circuit substantially reduces the consumption of refresh electrical power in a stand-by state without decreasing the reliability of the semiconductor memory device.
This application claims priority under 35 U.S.C. � 119 from Korean Patent Application 2003-69069, filed on Oct. 6, 2003, the contents of which are hereby incorporated by reference in their entirety for all purposes as if fully set forth herein.
Hereinafter, example embodiments of the present invention will be described in detail with reference to FIGS. 4 to 14 in which like components having like functions have been provided with like reference symbols and numerals.
The temperature sensor of FIG. 4 includes a differential amplifier DA of a current mirror type, a decrease resistance branch C, which is connected between a decrease resistance terminal NO1 of the differential amplifier DA and a ground VSS and in which a current is reduced by an increase of temperature, and an increase resistance branch A which is connected between an increase resistance terminal of the differential amplifier DA and the ground and in which a current increases with an increase in temperature. The temperature sensor also includes: a first resistance string part 150 having a plurality of resistances RU1–RU6 connected in series between the decrease resistance terminal NO1 and a resistance node NO2 of the decrease resistance branch C; a short-circuit switching part 160 for shorting the plurality of resistances RU1–RU6 individually and selectively in response to the sampling signals PTU0–PTU5; and a comparator OP1 for comparing a reference temperature output Oref, appearing in the increase resistance terminal, with a sensing temperature output OT1, appearing in the decrease resistance terminal NO1, and for outputting the comparison result OUT.
Junction diodes D2, D1 individually connected to the branches A, B of the differential amplifier DA have the same size as one another, and the P-type MOS transistors MP1,MP2,MP3 have a size ratio of 1:1:1. Furthermore, the N-type MOS transistors MN1,MN2,MN3 also determined as 1:1:1. The plurality of resistances RU1–RU6 have respectively different resistance values in the example embodiment of the invention. Further, the resistance RU1 among the resistances RU1–RU6 has a lowest resistance value and the resistance RU6 has a largest resistance value. Thus, the resistance values of the plurality of resistances RU1–RU6 are determined under a condition of RU1<RU2<RU3<RU4<RU5<RU6.
In the meantime, the short-circuit switching part 160 is composed of a plurality of N-type MOS transistors TR0–TR5, and is turned on when a corresponding sampling signal among the sampling signals PTU0–PTU5 is changed to a high state. Then, a corresponding resistance among the resistances RU1–RU6 is shorted operationally. That is, the plurality of N-type MOS transistors TR0–TR5 have a normally turned-off state so as to substantially reduce their electrical power consumption.
In the temperature sensor of FIG. 4 based on the above-described structure, the plurality of resistances RU1–RU6 installed within the first resistance string part 150 are selectively shorted, thus numerous trip points can be obtained without extending the number of decrease resistance branches.
In the case that a total resistance value of all of the plurality of resistances RU1–RU6 installed in the first resistance string part 150 of FIG. 4, together with the resistance of R1, is determined to be equal to the resistance value of the resistance R1 shown in FIG. 1, and the N-type MOS transistors TR0–TR5 are all turned off, then the current flowing in the branch C of the temperature sensor is provided as the graph I1 of FIG. 5 and an output of the comparator OP1 is provided as a waveform OUT of FIG. 6.
As described above, numerous trip points can be determined by shorting the resistances through use of one decrease resistance branch. In the meantime, though the example embodiments for the graphs I1 b, I2 b of FIG. 5 and the waveforms OU1 b, OU2 b of FIG. 6 are not shown in the drawings, they can be obtained by additionally connecting a second resistance string part 150, and a second short-circuit switching part 160, to the resistance node N02 of FIG. 4. In this case, if the transistors within the second short-circuit switching part 160 are normally turned on, then a transistor is turned-off, a resistance in the second resistance string part 150 is “short-released.” Thus, the composite resistance of the branch C increases to reduce a current flowing in the branch C.
Meanwhile, the OR gate 220 performs an OR operation for the first through (n+1)th sampling signals PTU0–PTUn, and outputs a comparator enable signal EN.
FIG. 9 is a circuit diagram for an example embodiment of the temperature sensor 101 shown in FIG. 7. This temperature sensor has the same configuration to the temperature sensor shown in FIG. 4, except for a resistance value trimming part 170 and the comparator OP1. In FIG. 9, the resistance value trimming part 170 individually varies resistance values for respective resistances RU1–RU6 of the first resistance string part 150, and is composed of fuses F1-1, F1-2, F2-1, F2-2, . . . , F6-2 which are made of polysilicon material and which may be cut by a light source, such as a laser beam, etc. The resistance value trimming part 170 is installed for the following reasons. Since the composite resistance value of the decrease resistance branch C may deviate from a determined value, even though a temperature tuning operation for matching a trip point to a designed temperature point is performed, it is desirable to perform a trimming operation on the resistance values of resistances of the branch C.
FIG. 10 is a circuit diagram for an example embodiment of a counting output part 300 shown in FIG. 7. The counting output part 300 includes a flip-flop circuit part constructed of a plurality of flip-flops T1–T3, in which the temperature sensing data OUT is received through a clock terminal CK of a first-stage flip-flop global search-and-replace T1, and in which an output is connected with the clock terminal of a subsequent flip-flop, and an input terminal T is fixed to a determined logic level VCC. The counting part 300 also includes a pass gate PG1–PG3 for transmitting outputs Q of the plurality of flipflops T1–T3 in response to the pass gate control signal PTR, and a latch L1–L3 for latching the outputs of the plurality of flipflops T1–T3 transmitted from the pass gate PG1–PG3.
FIG. 11 is a timing diagram for operations of the temperature sensing circuit referred to FIG. 7. In FIG. 11, waveforms PTU0–PTU3 correspond to the first through fourth sampling signals, the waveform OUT corresponds to the temperature sensing data of the comparator OP1, and the waveforms RCQ0–RCQ2 correspond to the counting data of the counting output part 300.
FIGS. 12 and 13 illustrate example embodiments of the oscillator shown in FIG. 7. In FIG. 12, the oscillator 400 includes an inverter chain constructed of an odd number of inverter stages IN10, IN11, IN12, a capacitor C1 connected between an output terminal of the inverter chain and ground, a plurality of resistances R1–Rn cascade-connected between the inverters IN10, IN11, and switching transistors NM1–NMn connected in parallel with the resistances R1–Rn, the switching transistors NM1–NMn being adapted to selectively short the resistances R1–Rn in response to the counting data RCQ0–RCQ(n−1). Meanwhile, in FIG. 13, the resistors R1–Rn are connected between the supply and ground voltages, VDD and ground, and the inverters IN10, IN11.
FIG. 14 is a circuit diagram illustrating in detail an example embodiment of the refresh counter 500 shown in FIG. 7. The refresh counter 500 includes a plurality of flipflops 510–512 in which the oscillation signal OSC of the oscillator is received through the clock terminal of the flipflop 510 provided in the first stage, and in which outputs Q are connected with a clock terminal CK and an input terminal T is fixed to a determined logic level.
It is assumed that the resistances RU1–RU6 of FIG. 9 are determined to individually change trip points in increments of 2� C., that the temperature sensor 101 of FIG. 9 is initially set as 45� C., and an ambient temperature of the memory cell array 700 is 51� C.
The oscillator 400 has the switching transistors NM1–NMn for selectively shorting the resistances R1–Rn of FIG. 12 in response to the counting data RCQ0–RCQn of the counting output part 300 shown in FIG. 7, thus the oscillator 400 outputs the oscillation signal OSC controlled for an oscillating period, depending upon a logic state of the counting data RCQ0–RCQn. For example, if the counting data RCQ0 is a high state, a corresponding resistance R1 is shorted operationally. When the composite resistance value of the oscillator 400 is reduced, a cycle of the oscillation signal OSC is shortened. This operation is also performed by the circuit shown in FIG. 13.
As described above, the temperature sensor has numerous trip points through the sampling signals, and the switching transistors NM1–NMn are selectively shorted by a logic level of the counting data RCQ0–RCQn so as to provide a fine control of the period of oscillation signal OSC.
The refresh counter 500 is configured as shown in FIG. 14, and outputs refresh counting data Q0–Q2 in response to the oscillation signal OSC, and the refresh control circuit 600 receives the data and outputs the fine-controlled refresh control signal RFCON in conformity with the temperature. Thereby, a refresh operating cycle is increased by a decrease in temperature, and is lengthened by an increase in temperature.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4014238Jun 23, 1975Mar 29, 1977C.G. Conn, Ltd.Tone signal waveform control network for musical instrument keying systemUS4395139Feb 20, 1981Jul 26, 1983Kabushiki Kaisha Daini SeikoshaTemperature detecting deviceUS4465379May 22, 1980Aug 14, 1984Kabushiki Kaisha Suwa SeikoshaTemperature detector circuit for timepieceUS5025248Sep 1, 1989Jun 18, 1991MicrothermoAutomatic temperature monitoring systemUS5375093Jan 21, 1993Dec 20, 1994Matsushita Electric Industrial Co., Ltd.Temperature detecting circuit and dynamic random access memory deviceUS5638418 *Jun 7, 1994Jun 10, 1997Dallas Semiconductor CorporationTemperature detector systems and methodsUS5739593Nov 25, 1996Apr 14, 1998Nec CorporationVoltage source circuit for generating a plurality of values of voltagesUS5795069Jan 2, 1997Aug 18, 1998Ssi Technologies, Inc.Temperature sensor and methodUS5835553 *Apr 22, 1996Nov 10, 1998Nec CorporationSemiconductor integrated circuit having a digital temperature sensor circuitUS5875142Jun 17, 1997Feb 23, 1999Micron Technology, Inc.Integrated circuit with temperature detectorUS5961215Sep 26, 1997Oct 5, 1999Advanced Micro Devices, Inc.Temperature sensor integral with microprocessor and methods of using sameUS6157244Oct 13, 1998Dec 5, 2000Advanced Micro Devices, Inc.Power supply independent temperature sensorUS6281760Jul 16, 1999Aug 28, 2001Texas Instruments IncorporatedOn-chip temperature sensor and oscillator for reduced self-refresh current for dynamic random access memoryUS6299347May 1, 2000Oct 9, 2001Exergen CorporationAmbient and perfusion normalized temperature detectorUS6316988Feb 28, 2000Nov 13, 2001Seagate Technology LlcVoltage margin testing using an embedded programmable voltage sourceUS6316991Mar 29, 2000Nov 13, 2001Cirrus Logic, Inc.Out-of-calibration circuits and methods and systems using the sameUS6320809Jul 5, 2000Nov 20, 2001Micron Technology, Inc.Low voltage level power-up detection circuitUS6348832Apr 17, 2000Feb 19, 2002Taiwan Semiconductor Manufacturing Co., Inc.Reference current generator with small temperature dependenceUS6489831Aug 28, 2000Dec 3, 2002Stmicroelectronics S.R.L.CMOS temperature sensorUS6504420 *Nov 12, 1999Jan 7, 2003Broadcom CorporationTemperature compensation for internal inductor resistanceUS6591210Nov 21, 2000Jul 8, 2003National Semiconductor CorporationCircuit and method to combined trim and set pointUS6643193 *Sep 20, 2002Nov 4, 2003Hitachi, Ltd.Semiconductor device, microcomputer and flash memoryUS6667925Feb 25, 2002Dec 23, 2003Fujitsu LimitedSemiconductor device having temperature detecting function, testing method, and refresh control method of semiconductor storage device having temperature detecting functionJP2003297929A Title not availableKR20030056382A Title not availableKR20040013885A Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS7383149Dec 12, 2006Jun 3, 2008Darryl WalkerSemiconductor device having variable parameter selection based on temperature and test methodUS7423473 *May 31, 2005Sep 9, 2008Samsung Electronics Co., Ltd.Sequential tracking temperature sensors and methodsUS7459955 *Sep 27, 2006Dec 2, 2008Sigmatel, Inc.Integrated circuit temperature sensing methodUS7480588Feb 20, 2007Jan 20, 2009Darryl WalkerSemiconductor device having variable parameter selection based on temperature and test methodUS7508250 *Jul 28, 2008Mar 24, 2009International Business Machines CorporationTesting for normal or reverse temperature related delay variations in integrated circuitsUS7508671 *Oct 10, 2003Mar 24, 2009Intel CorporationComputer system having controlled coolingUS7534035Dec 4, 2006May 19, 2009Samsung Electronics Co., Ltd.Temperature sensor for generating sectional temperature code and sectional temperature detection methodUS7535786Feb 20, 2007May 19, 2009Darryl WalkerSemiconductor device having variable parameter selection based on temperature and test methodUS7554869 *Jun 30, 2009Samsung Electronics Co., Ltd.Semiconductor memory device having internal circuits responsive to temperature data and method thereofUS7603249Feb 20, 2007Oct 13, 2009Darryl WalkerSemiconductor device having variable parameter selection based on temperature and test methodUS7610165 *Jun 29, 2007Oct 27, 2009Hynix Semiconductor, Inc.Semiconductor memory device having on die thermal sensorUS7639548 *Feb 24, 2009Dec 29, 2009Walker Darryl GSemiconductor device having variable parameter selection based on temperature and test methodUS7646659 *Jan 12, 2010Fujitsu Microelectronics LimitedSemiconductor device temperature sensor and semiconductor storage deviceUS7760570Jul 20, 2010Darryl WalkerSemiconductor device having variable parameter selection based on temperature and test methodUS7863965May 13, 2009Jan 4, 2011Hynix Semiconductor Inc.Temperature sensor circuit and method for controlling the sameUS7876135 *Jan 25, 2011Spectra Linear, Inc.Power-on reset circuitUS7953573Apr 2, 2010May 31, 2011Agersonn Rall Group, L.L.C.Semiconductor device having variable parameter selection based on temperature and test methodUS8005641Aug 23, 2011Agersonn Rall Group, L.L.C.Temperature sensing circuit with hysteresis and time delayUS8040742Oct 18, 2011Agersonn Rall Group, L.L.C.Semiconductor device having variable parameter selection based on temperature and test methodUS8049145Nov 1, 2011Agerson Rall Group, L.L.C.Semiconductor device having variable parameter selection based on temperature and test methodUS8058910 *Nov 15, 2011Cypress Semiconductor CorporationIntelligent power supervisorUS8060661Nov 15, 2011Cypress Semiconductor CorporationInterface circuit and method for programming or communicating with an integrated circuit via a power supply pinUS8061895 *Jan 30, 2009Nov 22, 2011Renesas Electronics CorporationSemiconductor deviceUS8072247Oct 4, 2007Dec 6, 2011Cypress Semiconductor CorporationProgrammable voltage regulatorUS8081532Dec 20, 2011Intellectual Ventures Holding 83 LLCSemiconductor device having variable parameter selection based on temperature and test methodUS8089306Jan 3, 2012Cypress Semiconductor CorporationIntelligent voltage regulatorUS8125243Sep 28, 2007Feb 28, 2012Cypress Semiconductor CorporationIntegrity checking of configurable data of programmable deviceUS8130024 *Mar 6, 2012Micron Technology, Inc.Temperature compensation via power supply modification to produce a temperature-independent delay in an integrated circuitUS8179193Jun 23, 2011May 15, 2012Cypress Semiconductor CorporationIntelligent voltage regulatorUS8269531Sep 18, 2012Cypress Semiconductor CorporationProgrammable power supervisorUS8277120 *Jan 11, 2010Oct 2, 2012Kabushiki Kaisha ToshibaSemiconductor integrated circuitUS8278978Oct 27, 2011Oct 2, 2012Cypress Semiconductor CorporationProgrammable voltage regulatorUS8308359Jan 15, 2010Nov 13, 2012Intellectual Ventures Holding 83 LLCSemiconductor device having variable parameter selection based on temperature and test methodUS8342747 *Jan 27, 2010Jan 1, 2013Samsung Electronics Co., Ltd.Temperature sensing circuit of semiconductor deviceUS8395436 *Mar 12, 2013Micron Technology, Inc.Temperature compensation via power supply modification to produce a temperature-independent delay in an integrated circuitUS8471609Jul 13, 2011Jun 25, 2013Luciano Processing L.L.C.Intelligent power supervisorUS8497453Sep 19, 2011Jul 30, 2013Intellectual Ventures Holding 83 LLCSemiconductor device having variable parameter selection based on temperatureUS8510584Nov 15, 2011Aug 13, 2013Luciano Processing L.L.C.Ultra low power sleep modeUS8680902Sep 11, 2012Mar 25, 2014Luciano Processing L.L.C.Programmable power supervisorUS8766662Sep 9, 2011Jul 1, 2014Cypress Semiconductor CorporationIntegrity checking of configuration data of programmable deviceUS8769177Mar 12, 2008Jul 1, 2014Cypress Semiconductor CorporationInterrupt latency reductionUS8786357May 7, 2012Jul 22, 2014Luciano Processing L.L.C.Intelligent voltage regulatorUS9004754 *Jun 30, 2011Apr 14, 2015Taiwan Semiconductor Manufacturing Company, Ltd.Thermal sensors and methods of operating thereofUS9143027Jun 24, 2013Sep 22, 2015Luciano Processing L.L.C.Intelligent power supervisorUS9194754 *Apr 30, 2014Nov 24, 2015Darryl G. WalkerPower up of semiconductor device having a temperature circuit and method thereforUS9274007 *Apr 30, 2014Mar 1, 2016Darryl G. WalkerSemiconductor device having temperature sensor circuitsUS9286991Mar 5, 2015Mar 15, 2016Darryl G. WalkerMulti-chip non-volatile semiconductor memory package including heater and sensor elementsUS9306492 *Feb 25, 2015Apr 5, 2016SK Hynix Inc.Oscillator and semiconductor device including the sameUS9361969 *May 15, 2014Jun 7, 2016SK Hynix Inc.Semiconductor device and method for driving the sameUS20050078451 *Oct 10, 2003Apr 14, 2005Ioan SauciucComputer system having controlled coolingUS20050141589 *Jun 30, 2004Jun 30, 2005Hynix Semiconductor Inc.Temperature sensing oscillator circuitUS20050146965 *Nov 5, 2004Jul 7, 2005Soo-Young KimSemiconductor memory device having internal circuits responsive to temperature data and method thereofUS20060098509 *May 31, 2005May 11, 2006Samsung Electronics Co., Ltd.Sequential tracking temperature sensors and methodsUS20060229839 *Mar 29, 2005Oct 12, 2006United Memories, Inc. Colorado SpringsTemperature sensing and monitoring technique for integrated circuit devicesUS20060267127 *May 25, 2006Nov 30, 2006Samsung Electronics Co., Ltd.Semiconductor temperature sensor capable of adjusting sensed temperatureUS20070018714 *Sep 27, 2006Jan 25, 2007Sigmatel, Inc.Temperature sensor system and methodUS20070160114 *Dec 4, 2006Jul 12, 2007Samsung Electronics Co., Ltd.Temperature sensor for generating sectional temperature code and sectional temperature detection methodUS20080106321 *Jun 29, 2007May 8, 2008Hynix Semiconductor Inc.Semiconductor memory device having on die thermal sensorUS20090002057 *Dec 12, 2007Jan 1, 2009Hynix Semiconductor Inc.Temperature sensor circuit and method for controlling the sameUS20090116539 *Jan 8, 2009May 7, 2009Fujitsu LimitedSemiconductor device temperature sensor and semiconductor storage deviceUS20090196326 *Jan 30, 2009Aug 6, 2009Renesas Technology Corp.Semiconductor deviceUS20090219066 *Mar 2, 2009Sep 3, 2009Spectralinear, Inc.Power-on reset circuitUS20100007404 *May 13, 2009Jan 14, 2010Mi Hyun HwangTemperature sensor circuit and method for controlling the sameUS20100189160 *Jan 27, 2010Jul 29, 2010Samsung Electronics Co., Ltd.Temperature sensing circuit of semiconductor deviceUS20100253416 *Jan 11, 2010Oct 7, 2010Kabushiki Kaisha ToshibaSemiconductor integrated circuitUS20110037138 *Feb 17, 2011Walker Darryl GSemiconductor Device having variable parameter selection based on temperature and test methodUS20110044118 *Dec 10, 2009Feb 24, 2011Walker Darryl GSemiconductor Device having variable parameter selection based on temperature and test methodUS20110044119 *Apr 2, 2010Feb 24, 2011Walker Darryl GSemiconductor Device having variable parameter selection based on temperature and test methodUS20110044372 *Feb 24, 2011Walker Darryl GSemiconductor Device having variable parameter selection based on temperature and test methodUS20110046912 *Jun 4, 2010Feb 24, 2011Walker Darryl GSemiconductor Device having variable parameter selection based on temperature and test methodUS20110187441 *Aug 4, 2011Micron Technology,Inc.Temperature Compensation Via Power Supply Modification to Produce a Temperature-Independent Delay in an Integrated CircuitUS20110255568 *Oct 20, 2011Taiwan Semiconductor Manufacturing Company, Ltd.Thermal sensors and methods of operating thereofUS20120146695 *Jun 14, 2012Micron Technology, Inc.Temperature Compensation Via Power Supply Modification to Produce a Temperature-Independent Delay in an Integrated CircuitUS20150124545 *May 15, 2014May 7, 2015SK Hynix Inc.Semiconductor device and method for driving the sameUS20150276501 *Apr 30, 2014Oct 1, 2015Darryl G. WalkerPower up of semiconductor device having a temperature circuit and method thereforUS20150276502 *Apr 30, 2014Oct 1, 2015Darryl G. WalkerSsemiconductor device having temperature sensor circuitsWO2009070002A1 *Jan 13, 2009Jun 4, 2009Mimos BerhadTemperature sensor with adjustable temperature coefficient* Cited by examinerClassifications U.S. Classification702/130, 365/189.09, 377/25, 327/513, 374/E03.002, 702/104International ClassificationG11C7/04, G01K7/00, G01K3/00, G01F15/00, G11C11/40Cooperative ClassificationG01K3/005European ClassificationG01K3/00CLegal EventsDateCodeEventDescriptionSep 17, 2004ASAssignmentOwner name: SAMSUNG ELECTRONICS CO., LTD., KOREA, REPUBLIC OFFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WON, MYUNG-GYOO;KIM, JAE-HOON;PARK, JONG-WOOK;REEL/FRAME:015804/0459Effective date: 20040908Mar 4, 2010FPAYFee paymentYear of fee payment: 4Apr 25, 2014REMIMaintenance fee reminder mailedSep 12, 2014LAPSLapse for failure to pay maintenance feesNov 4, 2014FPExpired due to failure to pay maintenance feeEffective date: 20140912RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services