专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

91. 发明专利

AU660990B2 Telephone dial-inbound data acquisition system with demand reading capability 未知
公开(公告)号：AU660990B2
公开(公告)日：1995-07-13
申请号：AU1854492
申请日：1992-06-25
申请人： SCHLUMBERGER IND INC
发明人： WHITE DARRYL C , WARD STEVEN M
IPC分类号： G01D4/00 , H04M11/00 , H04Q9/02 , H04M3/14
摘要： Apparatus for detecting an off-hook condition of a telephone line comprising : a telephone data set coupled to the telephone line ; means, coupled to the telephone line, for measuring an initial value indicative of an off-hook electrical characteristic of said telephone line ; means coupled to the telephone line, for measuring an average value of an electrical characteristic of said telephone line at a predetermined time ; means for comparing said initial value and said average value ; and means, responsive to said comparison, for causing said telephone data set to be established in an off-hook condition if said comparison differs by a predetermined amount.

92. 发明专利

CA2119972A1 PARALLEL OFF-HOOK DETECTION FOR BOTH LINE-AVAILABLE AND PHONE PICK-UP DETECTION 未知
公开(公告)号：CA2119972A1
公开(公告)日：1995-02-06
申请号：CA2119972
申请日：1994-03-25
申请人： SCHLUMBERGER IND INC
发明人： KRAMER RICHARD A , SWANSON SCOTT C
IPC分类号： H04M1/72 , H04M1/82 , H04M11/06 , H04M1/00
摘要： PARALLEL OFF-HOOK DETECTION FOR BOTH LINE-AVAILABLE AND PHONE PICK-UP DETECTION A secondary communications device, such as a modem, a facsimile machine, an automatic meter reader or an answering machine, shares a telephone line with a subscriber's telephone and must grant the telephone primary access to the line. The present invention prevents the secondary device from seizing the line when the telephone is already off-hook and will terminate a line seizure by the secondary device if the subscriber picks up the telephone handset during use of the line by the secondary device. An average interval for charging a capacitor to a threshold voltage in response to an on-hook voltage appearing across the telephone line is determined. When the secondary communications device is ready to use the line, circuitry measures an interval for charging the capacitor in response to the current voltage appearing across the telephone line. The secondary communication device seizes the line only if the measured interval does not exceed the average interval by more than a predetermined amount. After seizure by the secondary communication device, a steady-state condition is brought about between the secondary device, the line steady-state impedance, and the central office voltage source. If the line impedance drops from the steady-state value, the circuitry assumes that the subscriber has taken the telephone off-hook and terminates the line seizure by the secondary device.

93. 发明专利

FR2701591A1 Air-coupled unscreened current transformer 未知
公开(公告)号：FR2701591A1
公开(公告)日：1994-08-19
申请号：FR9400188
申请日：1994-01-11
申请人： SCHLUMBERGER IND INC
发明人： WENDELL GOODWIN R , ROBERTS CHARLES W
IPC分类号： H01F38/30 , H01F40/06
摘要： An air-coupled current transformer is proposed, with a primary current conductor and two secondary windings connected in such a way that the EMF induced in each winding by an interfering external magnetic flux is subtractive, whereas the EMF induced by the current in the primary is additive. Two ferromagnetic coils accentuate the rejection of the EMF induced by the interfering flux. Ceramic spacer pieces are inserted in the gaps separating the coils in order to keep the size of the gaps to a fixed value and to preserve a scale factor of the transformer independent of temperature.

94. 发明专利

AU651582B2 Two and three wire utility data communications system 未知
公开(公告)号：AU651582B2
公开(公告)日：1994-07-28
申请号：AU7647591
申请日：1991-05-13
申请人： SCHLUMBERGER IND INC
发明人： BRENNAN WILLIAM J JR , HAMILTON DAVID R , WYNN WARREN C JR
IPC分类号： G08C19/00 , G01D4/00 , G08C17/04 , G08C19/28 , H04L69/14 , H04Q9/00 , G06F3/00 , G08C15/06 , G08C19/06
摘要： A two wire/three wire utility data communications system for remotely reading utility meter registers. In the two wire version, a hand-held reading unit is inductively coupled over two wires via a port located remotely from a meter register. Alternatively, a meter interface unit (MIU) may be connected directly to the register via three wires. Each register includes one or more wheel position encoders. An AC interrogation signal is applied by the reading unit to encoder circuitry at the meter which powers the circuitry and causes the position of each encoder wheel to be read. In the two wire mode, register display information (e.g. the current meter reading) is transmitted back to the reading unit by varying the load (impedance) presented by the register side of the circuit. This causes a corresponding variation of the amount of current drawn from the reading unit. The current-modulated signal is decoded by the reading unit and converted into a register reading. The system can also operate in a three wire mode and read older fourteen wire encoded registers. Other features include remote programmability of register characteristics, the ability to interrogate multiple registers which share a common data bus, verification of encoder wheel positions before accepting a reading, real-time flow rate/leak detection, pulse output, and the capability of reading compound meters (i.e. meters having two registers to separately measure high/low flow rates).

95. 发明专利

CA1330714C MECHANICAL SENSOR FOR HIGH TEMPERATURE ENVIRONMENTS 未知
公开(公告)号：CA1330714C
公开(公告)日：1994-07-19
申请号：CA598135
申请日：1989-04-28
申请人： SCHLUMBERGER IND INC
发明人： BARTH PHILLIP W , PETERSEN KURT E
IPC分类号： G01L9/04 , G01L9/00 , H01L29/84 , G01L1/18
摘要： MECHANICAL SENSOR FOR HIGH TEMPERATURE ENVIRONMENTS A force or pressure sensor includes a monocrystalline silicon diaphragm coated with silicon dioxide upon which single crystalline silicon resistors are fused in a low profile pattern on the surface. The resistors are almost perfectly electrically isolated from each other and from the underlying silicon substrate. The structure is fabricated by forming resistors in a first wafer and then affixing that surface of the first wafer to the silicon dioxide layer on the second wafer. All of the first wafer except for the resistors has been removed, and metal contact capable of resisting elevated temperatures are formed to provide electrical connections to the resistors.

96. 发明专利

CA2045758C CORIOLIS-TYPE MASS FLOW METER FOR SANITARY USE 未知
公开(公告)号：CA2045758C
公开(公告)日：1994-06-21
申请号：CA2045758
申请日：1991-06-26
申请人： SCHLUMBERGER IND INC
发明人： NORTZ GREGORY J , CLARK W TOM
IPC分类号： G01F1/84 , G01F1/05
摘要： CORIOLIS-TYPE MASS FLOW METER FOR SANITARY USE A Coriolis-type mass flow meter for use in sanitary applications. A pair of sensing tubes have their ends rigidly mounted within bores formed within identical inlet and outlet fixtures. The ends of the tubes fit snugly within the bores and are ends brought out flush with the ends of the bores. The flush ends of the tubes are secured to the bores by means of welding. An annular flange is formed about the flush tube ends of the inlet and outlet fixtures to allow easy assembly and removal of the mass flow meter from its associated fluid flow pipeline or conduit. The inlet and outlet fixtures and tubes preferably are formed from a non-reactive, weldable material such as stainless steel. The mounting arrangement of the tubes within the bores of the inlet and outlet fixtures makes it easy to secure the tube ends to the fixtures by means of welding in a readily accessible location. These welds can then be easily smoothed or polished to remove any possible obstructions to fluid flow or hiding places for contamination. This arrangement results in a mass flow meter which is acceptable for sanitary applications, e.g. the measuring of mass flow and or density of foodstuffs.

97. 发明专利

CA2101115A1 APPARATUS AND METHOD FOR SENSING TAMPERING OF UTILITY METER 未知
公开(公告)号：CA2101115A1
公开(公告)日：1994-01-25
申请号：CA2101115
申请日：1993-07-22
申请人： SCHLUMBERGER IND INC
发明人： CARNEY MURRAY C
IPC分类号： G01R11/24 , G08B13/22
摘要： A device for detecting tampering of a utility meter includes sensors to detect a positional displacement of the meter and lose of power to the meter. On sensing a positional displacement of the meter, indicative of an attempt to remove the meter, a timer is activated to enable sensing a power loss to the meter. In response to detection of a power loss during the time period defined by the timer, an indication is stored in a nonvolatile memory of the tamper event. In response to loss of power with or without a detection of tampering, required parameters including utility consumption data are stored in nonvolatile memory. Remote access to and data retrieval from the nonvolatile memory and system are provided over telephone lines, power lines, or a radio frequency circuit.

98. 发明专利

HUT63523A TWO- AND THREE-WIRE DATA TRANSMISSION SYSTEM FOR TRANSMISSING DATA OF PUBLIC UTILITY WORKS 未知
公开(公告)号：HUT63523A
公开(公告)日：1993-08-30
申请号：HU175891
申请日：1991-05-24
申请人： SCHLUMBERGER IND INC
发明人： BRENNAN WILLIAM JAMES , HAMILTON DAVID RALPH , WYNN WARREN CANDLER
IPC分类号： G08C19/00 , G01D4/00 , G08C17/04 , G08C19/28 , H04L69/14 , H04Q9/00 , H04L12/48
摘要： A two wire/three wire utility data communications system for remotely reading utility meter registers. In the two wire version, a hand-held reading unit is inductively coupled over two wires via a port located remotely from a meter register. Alternatively, a meter interface unit (MIU) may be connected directly to the register via three wires. Each register includes one or more wheel position encoders. An AC interrogation signal is applied by the reading unit to encoder circuitry at the meter which powers the circuitry and causes the position of each encoder wheel to be read. In the two wire mode, register display information (e.g. the current meter reading) is transmitted back to the reading unit by varying the load (impedance) presented by the register side of the circuit. This causes a corresponding variation of the amount of current drawn from the reading unit. The current-modulated signal is decoded by the reading unit and converted into a register reading. The system can also operate in a three wire mode and read older fourteen wire encoded registers. Other features include remote programmability of register characteristics, the ability to interrogate multiple registers which share a common data bus, verification of encoder wheel positions before accepting a reading, real-time flow rate/leak detection, pulse output, and the capability of reading compound meters (i.e. meters having two registers to separately measure high/low flow rates).

99. 发明专利

DE3878822T2 未知
公开(公告)号：DE3878822T2
公开(公告)日：1993-06-09
申请号：DE3878822
申请日：1988-10-18
申请人： SCHLUMBERGER IND INC
发明人： HONICK RONALD J
IPC分类号： H04M11/00 , H04M19/08
摘要： A low power consuming signal detection device which is attached to a telephone line is provided. The device has means for supplying power (16) within the device with an impedance of at least 5 megohms across the phone line (10, 12), means for amplifying signals (20) on the line, phase-locked-loop signal sensing means (22, 24, 26) for determining when the frequency of the amplified signal is within a predefined bandwidth, and lock detection means (28) for outputting a control signal when the frequency of the signal is within the predetermined bandwidth for a predetermined period of time. The device may be powered by a telephone central office battery by using means for converting telephone line battery potential to the required supply voltage.

100. 发明专利

CA2075467A1 SYSTEM AND METHOD FOR INTRODUCING METER SENSOR HYSTERESIS 未知
公开(公告)号：CA2075467A1
公开(公告)日：1993-02-07
申请号：CA2075467
申请日：1992-08-06
申请人： SCHLUMBERGER IND INC
发明人： SWANSON SCOTT C
IPC分类号： G01R21/133 , G08C23/04 , G01R11/36 , G01D5/34
摘要： A method and system is disclosed for accurate remote reading of an electricity meter. An optical detection arrangement, including a light emitter and sensor, have positioned in the light path therebetween a cutout portion of the meter shaft. Rotation of the shaft affects the amount of light passed to the sensor. Registration errors which may occur in a linear transition operating range are avoided by provision of detector threshold hysteresis. A microprocessor sets timing pulses for emitter energization, establishes a detection period of uniform length of time for each energizing pulse and produces, during each detection period, a digital signal having a logic level indicative of the presence or absence of light transmitted to said sensor, whereby a correlation between light transitions and power usage can be made. Accuracy of detection is improved under microprocessor control by introducing hysteresis in the delay between emitter energization and detection, in the voltage threshold in a comparator connected to the detection circuit, or in emitter energization driving current. The hysteresis is determined in accordance with the memorized state of the last previous detected signal.

你已经成功收藏专利！

检索式保存成功!

IPRDB

热门服务

关于我们

友情链接

联系方式