Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 7397364 | Digital wireless position sensor A method is provided for tracking an object, including positioning a radio frequency (RF) driver to radiate an RF driving field toward the object, and fixing to the object a wireless transponder that includes a power coil and at least one sensor coil. The method als... | 07/08/2008 |
| 7327249 | Barrier operator system having multiple frequency receivers A barrier operator system is disclosed that is capable of receiving different wireless signals. The system includes a primary controller that is connected to a first receiver which receives a first wireless signal. And the system includes a second receiver circuit t... | 02/05/2008 |
| 7174137 | Wireless transmit-only apparatus and method A wireless transmit-only apparatus (20) can be comprised of a controller (21) that selectively controls which of a plurality of resonant devices (24 and 25) are utilized to influence the transmission carrier frequency of a transmitter ( | 02/06/2007 |
| 7154410 | Multifrequency garage door opener A garage door power module is provided with the capability of operating over a number of different operating frequencies by configuring a power module chassis with a receptacle for receiving radio receivers where each of the receivers is adapted to receive one of th... | 12/26/2006 |
| 7071815 | Radio frequency identification system with separately located transmitters and receivers A radio frequency identification (RFID) system with separately located transmitters and receivers which lowers system cost. The system includes a plurality of transmitters for interrogating radio frequency identification tags attached to items on store shelves, a pl... | 07/04/2006 |
| 7068169 | Use of a subcarrier in an organic semiconductor radio frequency identification system A radio frequency identification system comprising a radio reader circuit operable to emit a radio frequency carrier signal modulated with a subcarrier, which has a subcarrier modulation rate. The radio frequency identification tag circuit is operable to extract the... | 06/27/2006 |
| 7009529 | Multifrequency garage door opener A garage door power module is provided with the capability of operating over a number of different operating frequencies by configuring a power module chassis with a receptacle for receiving radio receivers where each of the receivers is adapted to receive one of ra... | 03/07/2006 |
| 6967573 | Transmitter and a method for transmitting data A transmitter or a method for transmitting data from a first antenna imposes a low level phase modulation, for example of less than 90°, on a carrier signal in accordance with a data signal to create a modulated signal, preferably having a carrier frequency and sid... | 11/22/2005 |
| 6911876 | Communication terminal for transceiving two frequencies using a common one turn antenna The invention relates to a terminal for communication with data supports which function in a non-contact manner, comprising a transreceiver circuit with two resonant circuits with antenna and condenser for the emitting of two radio frequency fields of different carr... | 06/28/2005 |
| 6895252 | Economical extension of the operating distance of an RF remote link accommodating information signals having differing carrier frequencies A system for economically extending the effective operational range of an infrared remote control system having a remote control unit with an infrared transmitter, and a controlled device having an infrared receiver. The system includes a first transmitter to receiv... | 05/17/2005 |
| 6847303 | Multifrequency garage door opener A garage door power module is provided with the capability of operating over a number of different operating frequencies by configuring a power module chassis with a receptacle for receiving radio receivers where each of the receivers is adapted to receive one of ra... | 01/25/2005 |
| 6812824 | Method and apparatus combining a tracking system and a wireless communication system System for tracking mobile tags. Cell controllers with multiple antenna modules generate a carrier signal which is received by the tags. Tags shift the frequency of the carrier signal, modulate an identification code onto it, and transmit the resulting tag signal at... | 11/02/2004 |
| 6732923 | Radio frequency identification system and method A radio frequency (RF) identification system and method which rely on the presence or absence of unique frequency signals. The system includes an RF interrogator which transmits signals at a plurality of different frequencies and which receives first frequencies of ... | 05/11/2004 |
| 6693392 | Method and apparatus for generating a flash or a series of flashes from a multiparameter light A multiparameter light is a type of theater light that includes an arc lamp and a shutter in combination with one or more optical components for creating various lighting effects, suitable electrical and mechanical actuating components, and suitable power... | 02/17/2004 |
| 6603388 | Security system and method A security system for actuating a security mechanism of a vehicle includes a transceiver coupled to the security mechanism and having one transmission channel for transmitting a first signal and a number of reception channels. A remote radio-frequency tra... | 08/05/2003 |
| 6600270 | Method and apparatus for generating a flash or series of flashes from a multiparameter light A multiparameter light is a type of theater light that includes an arc lamp and a shutter in combination with one or more optical components for creating various lighting effects, suitable electrical and mechanical actuating components, and suitable power... | 07/29/2003 |
| 6275166 | RF remote appliance control/monitoring system A system for managing a distributed array of appliances includes a headend computer having a low power main transceiver and a distributed array of relay units. Each relay unit includes a low power satellite transceiver, a microcomputer connected to the sa... | 08/14/2001 |
| 6268797 | Integrated portable tracking signal and access authorization signal generator A hand held unit is disclosed, the unit including a tracking signal generator and an access authorization signal generator, each signal generator being separately and independently actuatable by a user.... | 07/31/2001 |
| 6243000 | Wireless rolling code security system A processor-based transmitter-receiver system and method in which a receiver receives coded signals from at least two transmitters. A circuit for receiving a first coded signal from a first transmitter and a second coded signal from a second transmitter. ... | 06/05/2001 |
| 5940431 | Access technique of channel hopping communications system Establishing a connection between a paging unit and a standby unit in a channel hopping communications system includes activating the standby unit for an activation time period out of every standby time period. During each activation time period, the stan... | 08/17/1999 |
| 5933074 | Remote control transmitter broadcasting RF signals conveying plural information components A unique transmitter broadcasting a single RF (radio frequency) signal in response to a single input for controlling a plurality of electrical vehicle accessories. To control the plurality of accessories, the RF signal conveys multiple information compone... | 08/03/1999 |
| 5901150 | Modular system, particularly for biomedical applications, addressable unit and a communication system for use therein A modular system (10) for use, e.g. in infusion systems. The system includes a base unit (20) and one or more modules (30). A mechanical/electrical connecting system (21 to 24) is disclosed enabling safe connection of the various units in the system while... | 05/04/1999 |
| 5841390 | Remote transmitter-receiver controller for multiple systems The present invention provides a transmitter-receiver system which may selectively operate at one of a plurality of transmission frequencies and may selectively encode/decode the transmitted data in one of a plurality of data transmission formats. The pre... | 11/24/1998 |
| 5793306 | Identification systems employing frequency-based coded information An identification or protection system for vehicles, doors, lights and other electronic objects possessing a disabled state, having a disabling circuit operatively associated with the identification system so that when said resulting circuit is activated,... | 08/11/1998 |
| 5734968 | Safe radio control system A remote control system for actuating special effects theatrical devices is disclosed in which a transmitter generates and transmits two different signals, and a receiver includes first and second receiver circuits such that the first signal arms the rece... | 03/31/1998 |
| 5729191 | Vehicle security system having enhanced control features A vehicle security system includes a controller for performing a function responsive to receipt of a corresponding command signal, and a remote transmitter for sending a command signal from a plurality of banks of command signals. More particularly, the r... | 03/17/1998 |
| 5699421 | Telephone answering device with low cost dual tone multi-frequency detector A telephone answering device (TAD) includes a remote access mode which is operative responsive to dual tone multi-frequency (DTMF) signals. At least three bandpass filters each receive an input signal from a telephone line interface provided in the TAD. A... | 12/16/1997 |
| 5682379 | Wireless personal local area network A transceiver apparatus for creating a wireless personal local area network between a computer terminal and one or more peripheral devices. A separate transceiver is connected to the computer terminal and to each peripheral device. The transceivers can be... | 10/28/1997 |
| 5680134 | Remote transmitter-receiver controller system A transmitter-receiver controller system for remote actuation of devices or appliances such as security systems and garage door opener systems. The transmitter and receiver each utilize a programmable microcontroller for encoding and decoding signals. The... | 10/21/1997 |
| 5675395 | Remote receiver that coordinates command signals from differing sources including radio frequency and infrared sources A remote receiver is disclosed that accepts command signals from infrared transmitters and radio frequency transmitters and that combined the command signals into a final non overlapping command signal according to a preselected priority among the command... | 10/07/1997 |
| 5638056 | Remote control apparatus A first carrier signal generator (15) generates a carrier signal (S1) at a first frequency to modulate a preset identification code (S). A second carrier signal generator (16) generates a carrier signal (S2) at a second frequency, distinct from the first ... | 06/10/1997 |
| 5610579 | Apparatus and method for selecting a control source for an electrical switching device A controller for an electrical switching device such as a motor starting contactor including separable contacts, an operating mechanism for operating the separable contacts and a control mechanism responsive to a plurality of control sources for controlli... | 03/11/1997 |
| 5583866 | Method for delivering broadcast packets in a frequency hopping local area network A method used in a communication system (10) having central controllers (14) in communication with a plurality of user devices (12) where synchronizing data (34) and user data (35) are transmitted for a predetermined period of time defining a dwell (30). ... | 12/10/1996 |
| 5559508 | Emergency vehicle detector An emergency vehicle contains a transmitter for generating and transmitting a pair of fixed continuous wave signals which are distinguishable from each other in a preselected frequency band. A passenger vehicle contains a receiver which detects and distin... | 09/24/1996 |
| 5542118 | Induction field coupled transmission system incorporating a passive transmitter A remote, unpowered passive transmitter has a tank circuit, a coil and capacitor. The capacitor is variable to vary the frequency of the tank. This is coupled to a receiver having a hybrid splitter. With four ports, two balanced, opposing ports connect to... | 07/30/1996 |
| 5541589 | Power meter data acquisition and control system Each of a plurality of utility clients has a meter at the client location. A reader, such as an infrared emitter and optical photosensor arrangement, obtains consumption information from the meter and provides the information to a microprocessor. The micr... | 07/30/1996 |
| 5504475 | Pricing display system A system comprises a central unit and a plurality of display modules each adapted to show on a display information received from the central unit, for example for displaying prices in a store. The central unit comprises a transmitter including a current l... | 04/02/1996 |
| 5442696 | Method and apparatus for detecting control signals The present invention provides a method and apparatus for detecting control signal information for an element of a communication system. The control signal information is included in one or more segments of a signal communicated over a communication syste... | 08/15/1995 |
| 5396224 | Telemetered patient location system and method A system and method for locating patients in a hospital using M different frequency patient transmitters and N fixed location antennas within the hospital for receiving the patient signals. The received signals for each antenna are separated from the sign... | 03/07/1995 |
| 5381137 | RF tagging system and RF tags and method RF tagging system (10) has a plurality of resonant circuits (13) on a tag (12). When the tag (12) enters a detection zone (14), the system determines the resonant frequency of each of the resonant circuits (13) and produces a corresponding code. Preferabl... | 01/10/1995 |
