Did You Know...
...Daniel Webster invented a "bull plow" to pull out tree stumps. It didn't catch on because it was huge and required four oxen to pull it!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6226194 | DC/DC converter The invention relates to a DC/DC converter operating on the principle of a charge pump and comprising a first capacitor C1 alternatingly charged via four MOSFETs M1-M4 to the input voltage and then discharged in series with the input voltage via a second ... | 05/01/2001 |
| 6133834 | Method of trimming film type antennas A method of tuning the resonance frequency of a transponder to a target frequency is described, wherein a transponder comprises a film antenna with an IC (IC) mounted to the film antenna (L) and an integrated resonance capacitor (C) is part of a IC. Durin... | 10/17/2000 |
| 6118189 | Identification system reader with multiplexed antennas An electronic system 8 is disclosed herein. The system includes circuitry 10 for processing a signal and a plurality of antennas 12a-12b. A plurality of switches 22a-22b are also included. Each of the switches 22a-22b is coupled between the processing cir... | 09/12/2000 |
| 5970148 | Low cost encryption transponder Novel means of achieving increased security while still obtaining a low cost, manufacturable device are disclosed and claimed. The first mode of operation is the learn mode which provides means for initial checkout with no security. In the learn mode of o... | 10/19/1999 |
| 5948116 | Bit error correction algorithm A corrected digital response signal is generated from a corrupted transponder response signal by receiving the response signal an odd number of times, greater than one, and sampling each received response signal a predetermined number of times. Then, the ... | 09/07/1999 |
| 5841297 | Circuit arrangement for driving an MOS field-effect transistor allocated to the supply circuit of an electrical load A circuit arrangement 10 for driving an MOS field-effect transistor QO allocated to the supply circuit KO of an electrical load RL contains a charging circuit K1 and a discharging circuit K2, which can be alternatively connected to the MOS fiel... | 11/24/1998 |
| 5751692 | Bus signal detector A bus signal detector for a signal transmitted via a bus (12) has an edge detector (14) which supplies a signal (SF1) indicating the occurrence of a signal edge (F1) when the voltage on the bus (12) suddenly changes by at least a predetermined ... | 05/12/1998 |
| 5717348 | Self adjusting edge detector circuit A edge detector for the production of output signal in a manner dependent on positive and negative edges of a square wave signal comprises a differential amplifier with two base-coupled transistors (Q1, Q2). Each emitter of such transistors is connected v... | 02/10/1998 |
| 5642059 | Bus driver circuit with overvoltage protection A bus driver circuit having a driver input (16) for the reception of a data signal and a driver output (20) for the application of the output voltage of a voltage source (Vcc) to a bus core (10) in a manner dependent on the presence of a data signal at th... | 06/24/1997 |
| 5631198 | Method for making a piezoresistive pressure sensor of semiconductor material employing anisotropic etching A semiconductor device comprises a piezoresistive pressure sensor (12), which has a membrane (14), which is constituted by a conducting epitaxy layer (16), which is applied to a conducting semiconductor substrate (18) of the opposite conductivity. On the ... | 05/20/1997 |
| 5600176 | Integrated voltage divider Integrated voltage divider comprising partial resistors (R1 ,R2) formed of paths of polycrystalline semiconductor material applied over a dielectric layer (4) on a semiconductor substrate (5). Under the paths, each forming a partial resistor (R1,R2) in th... | 02/04/1997 |
| 5597534 | Apparatus for wireless chemical sensing A method and apparatus for wireless sensing of chemical parameters is provided in which an interrogation unit (14) transmits interrogation signals. A chemical sensor (12) generates an output based on predetermined chemical parameters. The chemical sensor ... | 01/28/1997 |
| 5570008 | Band gap reference voltage source For compensating the Early effect a band gap reference voltage source includes current mirror circuits (T4, Q3 and T1, Q1 as well as T2, Q2) to ensure that the currents necessary for achiev... | 10/29/1996 |
| 5561430 | Inductor/antenna for a recognition system An improved inductor/antenna (100)improves the selectivity of a recognition system (10) by ensuring that only the transponder (14) closest to the inductor/antenna (100) of an interrogator (12) receives therefrom, and reacts to, an interrogation signal (S1... | 10/01/1996 |
| 5554875 | Semiconductor device with force and/or acceleration sensor A semiconductor device with a force and/or acceleration sensor (12), which has a spring-mass system (14, 16) responsive to the respective quantity to be measured and whose mass (16) bears via at least one resilient support element (14) on a semiconductor ... | 09/10/1996 |
| 5552789 | Integrated vehicle communications system An integrated vehicle communications system for on-board use within a vehicle which may also communicate with external portions of the system which includes miniaturized, self-contained read/write transponders 20, 22, 30 of the type disclosed in Schuerman... | 09/03/1996 |
| 5550536 | Circuit frequency following technique transponder resonant A transponder system (10) includes an interrogation unit (12) that transmits a first frequency F1 representing a binary zero, and a second frequency F2, representing a binary one. These signals are transmitted from an interrogator resonant circuit (22) wi... | 08/27/1996 |
| 5550548 | Interrogator for detecting adjacent transponders A method for interrogating remote transponders having the steps of: sending an RF interrogation pulse from an interrogator (10), receiving by a first and second transponder (12,12a) the RF interrogation pulse, and establishing in a resonant circuit (130) ... | 08/27/1996 |
| 5543798 | Method of providing a synchronized data stream suitable for use in a combined FDX and HDX RF-ID system In a method for transmitting a data message comprising a synchronization section and a data section stored in a transponder device (10) to an interrogating device (12) in full duplex mode. The interrogating device (12) continuously emits an interrogating ... | 08/06/1996 |
| 5541604 | Transponders, Interrogators, systems and methods for elimination of interrogator synchronization requirement A Radio Frequency Identification (RFID) system having an interrogator (12) and a transponder (14). The interrogator has a first tuned circuit (28) of a powering frequency for sending a powering burst to a transponder (14), a filter/demodulator (64) for re... | 07/30/1996 |
| 5525994 | Transponder interface circuit A transponder interface circuit (172) operates to allow communication between a transponder controller (104) and external circuitry. The interface circuit (172) has a buffer memory (184,186) that allows the transponder controller (104) and the external ci... | 06/11/1996 |
| 5514898 | Semiconductor device with a piezoresistive pressure sensor A semiconductor device comprises a piezoresistive pressure sensor (12), which has a membrane (14), which is constituted by a conducting epitaxy layer (16), which is applied to a conducting semiconductor substrate (18) of the opposite conductivity. On the ... | 05/07/1996 |
| 5491715 | Automatic antenna tuning method and circuit A method of matching the resonant frequency of an antenna resonant circuit (18, 46) to the output frequency of a transmitter output stage (26), the method includes the step of providing a powering signal from the transmitter output stage (26) to the anten... | 02/13/1996 |
| 5489908 | Apparatus and method for identifying multiple transponders Apparatus and method for identifying a plurality of transponders (10-16) located within an inquiry field (18) of an interrogation unit (20) are provided. Each transponder (10-16) is assigned an unique identification code, and the interrogation unit (20) d... | 02/06/1996 |
| 5488288 | Circuit arrangement integrated in a semiconductor circuit The present invention relates to a circuit arrangement integrated in a semiconductor circuit. In modern microprocessor systems with high clock rates (50 MHz and more) special chips with narrow tolerance ranges as regards their switching speed are required... | 01/30/1996 |
| 5479171 | Extended range RF-ID transponder An transponder arrangement (10) for use with tires (20) is described. The arrangement (10) includes an antenna (14) which is mounted about the tire's (20) perimeter. The antenna (14) preferably has a coupling coil (16) at one end. A transponder (12) is pr... | 12/26/1995 |
| 5471212 | Multi-stage transponder wake-up, method and structure A system and method which conserves energy in the operation of a transponder or tag (14) by providing that the transponder (14) be enabled or awakened in multiple stages. A threshold detector (62) is provided which measures the power level of received RF ... | 11/28/1995 |
| 5457461 | Method and arrangement for detecting adjacent transponders A method for interrogating remote transponders having the steps of: sending an RF interrogation pulse from an interrogator (10), receiving by a first and second transponder (12,12a) the RF interrogation pulse, and establishing in a resonant circuit (130) ... | 10/10/1995 |
| 5455575 | Multi-interrogator, datacom and transponder arrangement A multi-interrogator transponder arrangement is disclosed. The transponder arrangement comprises a first interrogation unit (10) comprising a first wireless datacom transceiver (19) which transmits at least one RF interrogation signal. The arrangement als... | 10/03/1995 |
| 5453747 | Transponder systems for automatic identification purposes A method of communicating between an interrogator (10) and at least a first and second transponder (12). The transponders (12)are separately located within a first and a second vehicle (20) travelling within a first and a second traffic lane, respectively... | 09/26/1995 |
| 5450088 | Transponder arrangement A transponder arrangement is described having an interrogator unit (10) which transmits at least one RF programming sequence and at least one RF interrogation pulse. The responder unit (12) includes a responder unit receiver (130) for receiving data trans... | 09/12/1995 |
| 5446373 | Method of measuring the consumption of electrical energy In a method for measuring the consumption of electrical energy by a consumer the momentary values of the alternating voltage and alternating current are measured alternately in the time spacing of a sampling cacle. Each measured momentary value is stored.... | 08/29/1995 |
| 5444448 | Arrangement interrogation unit for transponder An interrogation unit which has a control circuit and an RF oscillator is described. The interrogation unit further has a transmitter which receives the output of the RF oscillator and transmits at least one RF interrogation pulse of a first frequency for... | 08/22/1995 |
| 5440274 | Phase detector circuit and PLL circuit equipped therewith A phase detector circuit (10) for generating an analog signal (VR) dependent upon the phase difference between two digital signals (VE, VA) includes two NOR circuits (20, 27) to the inputs (18, 26; 28, 24) of which the two digital signals are supplied on ... | 08/08/1995 |
| 5438335 | Responder unit for transponder arrangement A responder unit for communicating with an interrogator unit which sends an RF interrogation pulse thereto is described. The responder unit includes an energy accumulator which stores the energy contained in the RF interrogation pulse to be used to power ... | 08/01/1995 |
| 5436581 | Circuit arrangement for monitoring the drain current of a metal oxide semiconductor field effect transistor In the case of a circuit arrangement for monitoring the drain current of a metal oxide semiconductor field effect transistor To whose effective transistor area is subdivided in order to provide an MOS measuring transistor To ' and an... | 07/25/1995 |
| 5396251 | Electronic transponder tuning procedure A method is disclosed herein for tuning a responder unit (12). The method comprises the steps of storing energy in a responder unit energy accumulator (136) in a contactless fashion by RF energy transmitted from the interrogator unit (10) to the responder... | 03/07/1995 |
| 5374858 | Bus driver circuit A bus driver circuit for applying a binary signal to a bus line comprises an input transistor (Q1) for receiving the signal to be applied to the bus line and an output transistor (Q2) which taps the signal from the emitter of the inp... | 12/20/1994 |
| 5374930 | High speed read/write AVI system A transponder (14) for communicating with an interrogator (12) has a high Q-factor resonant circuit (34) of frequency f1 for receiving RF powering signals. The transponder also has a tuning circuit (56,58) which when in electrical communication... | 12/20/1994 |
| 5329247 | Switchable MOS current mirror The present invention relates to a switchable MOS current mirror having an input and an output current branch (1, 2), a plurality of first and second MOS-field-effect transistors, and a circuit section containing a third and a fourth MOS field effect tran... | 07/12/1994 |
