Mohammad A Rehman

US Patent:

6362737, Mar 26, 2002

Filed:

Aug 11, 1999

Appl. No.:

09/372274

Inventors:

James L. Rodgers - Mesa AZ
John J. Coulthard - Scottsdale AZ
Billy C. Fowler - Phoenix AZ
Howard K. Jaecks - Mesa AZ
Roc A. Lastinger - Mesa AZ
Paul A. Picard - Mesa AZ
Mohammad A. Rehman - Chandler AZ

Assignee:

RF Code, Inc. - Mesa AZ

International Classification:

G08B 1314

US Classification:

3405721, 3405722, 3405724, 340 101, 340 102, 340 103, 375219, 342 44

Abstract:

An object identification system includes a monitor and a plurality of transceivers that communicate over a common medium. The monitor includes a first transmitter, a first receiver, and a processor. Each transceiver includes a resonant circuit, a transmitter, a receiver, and an antenna coupled to the resonant circuit. The processor performs a method for performing transceiver communication that includes the steps of: (a) transmitting from the first transmitter a first frequency for a first duration; (b) after lapse of the first duration, receiving via the first receiver a response signal from at least one of the resonant circuits; (c) determining a second frequency from the received response signal; and (d) performing transceiver communication using the second frequency. Transceivers of the type having a resonant circuit coupled to an antenna, when operating in close proximity to each other, may interfere with the response from a single transceiver by absorbing the energy intended to be received by the transceiver, absorbing the energy transmitted by the transceiver, or altering the resonant frequency of the resonant circuit. By determining the second frequency for transceiver communication, the monitor may establish communication with the single transceiver at a frequency better suited for transferring operative power to the transceiver, conducting an interrogation protocol for identifying the transceiver, or for data transfer.

US Patent:

6831562, Dec 14, 2004

Filed:

Mar 9, 2001

Appl. No.:

09/802728

Inventors:

James L. Rodgers - Mesa AZ
John J. Coulthard - Scottsdale AZ
Billy C. Fowler - Phoenix AZ
Howard K. Jaecks - Mesa AZ
Roc A. Lastinger - Mesa AZ
Paul A. Picard - Mesa AZ
Mohammad A. Rehman - Chandler AZ

Assignee:

RF Code, Inc. - Mesa AZ

International Classification:

G08B 1314

US Classification:

3405724, 340 101, 340 102, 340 103, 340 104, 340 105, 375219, 235436, 455 73

Abstract:

An object identification system includes a monitor and a plurality of transceivers that communicate over a common medium. The monitor includes a first transmitter, a first receiver, and a processor. Each transceiver includes a resonant circuit, a transmitter, a receiver, and an antenna coupled to the resonant circuit. The processor performs a method for performing transceiver communication that includes the steps of: (a) transmitting from the first transmitter a first frequency for a first duration; (b) after lapse of the first duration, receiving via the first receiver a response signal from at least one of the resonant circuits; (c) determining a second frequency from the received response signal; and (d) performing transceiver communication using the second frequency.

US Patent:

6982646, Jan 3, 2006

Filed:

Aug 3, 2001

Appl. No.:

09/921956

Inventors:

James L. Rodgers - Mesa AZ, US
John J. Coulthard - Scottsdale AZ, US
Billy C. Fowler - Phoenix AZ, US
Howard K. Jaecks - Mesa AZ, US
Roc A. Lastinger - Mesa AZ, US
Paul A. Picard - Mesa AZ, US
Mohammad A. Rehman - Chandler AZ, US

Assignee:

RF Code, Inc. - Mesa AZ

International Classification:

G08B 13/14

US Classification:

3405727, 340 101, 340 35, 340531, 340505, 4552771

Abstract:

An object identification system includes a monitor and a plurality of transceivers that communicate over a common medium. The monitor includes a first transmitter, a first receiver, and a processor. Each transceiver includes a resonant circuit, a transmitter, a receiver, and an antenna coupled to the resonant circuit. The processor performs a method for performing transceiver communication that includes the steps of: (a) transmitting from the first transmitter a first frequency for a first duration; (b) after lapse of the first duration, receiving via the first receiver a response signal from at least one of the resonant circuits; (c) determining a second frequency from the received response signal; and (d) performing transceiver communication using the second frequency. Transceivers of the type having a resonant circuit coupled to an antenna, when operating in close proximity to each other, may interfere with the response from a single transceiver by absorbing the energy intended to be received by the transceiver, absorbing the energy transmitted by the transceiver, or altering the resonant frequency of the resonant circuit. By determining the second frequency for transceiver communication, the monitor may establish communication with the single transceiver at a frequency better suited for transferring operative power to the transceiver, conducting an interrogation protocol for identifying the transceiver, or for data transfer.

US Patent:

7633378, Dec 15, 2009

Filed:

Dec 15, 2005

Appl. No.:

11/305376

Inventors:

James L. Rodgers - Mesa AZ, US
John J. Coulthard - Scottsdale AZ, US
Billy C. Fowler - Phoenix AZ, US
Howard K. Jaecks - Mesa AZ, US
Roc A. Lastinger - Mesa AZ, US
Paul A. Picard - Mesa AZ, US
Mohammad A. Rehman - Chandler AZ, US

Assignee:

RF Code, Inc. - Austin TX

International Classification:

G08B 13/14

US Classification:

340 105, 340 101, 340 103, 340 104, 3405721

Abstract:

An object identification system includes a monitor and a plurality of transceivers that communicate over a common medium. The monitor includes a first transmitter, a first receiver, and a processor. Each transceiver includes a resonant circuit, a transmitter, a receiver, and an antenna coupled to the resonant circuit. The processor performs a method for performing transceiver communication that includes the steps of: (a) transmitting from the first transmitter a first frequency for a first duration; (b) after lapse of the first duration, receiving via the first receiver a response signal from at least one of the resonant circuits; (c) determining a second frequency from the received response signal; and (d) performing transceiver communication using the second frequency. Transceivers of the type having a resonant circuit coupled to an antenna, when operating in close proximity to each other, may interfere with the response from a single transceiver by absorbing the energy intended to be received by the transceiver, absorbing the energy transmitted by the transceiver, or altering the resonant frequency of the resonant circuit. By determining the second frequency for transceiver communication, the monitor may establish communication with the single transceiver at a frequency better suited for transferring operative power to the transceiver, conducting an interrogation protocol for identifying the transceiver, or for data transfer.

US Patent:

8526636, Sep 3, 2013

Filed:

Jul 7, 2010

Appl. No.:

12/832010

Inventors:

Venkatesh P. Pai - Gilbert AZ, US
Mohammad Rehman - Chandler AZ, US
Umesh Jayamohan - Gilbert AZ, US

Assignee:

Protek Devices LP - Tempe AZ

International Classification:

H04B 15/00

US Classification:

381 945, 381 941

Abstract:

A click-noise suppression system having MOSFET transistor switches positioned between the preamplifiers and coupling capacitors of an audio system wherein the suppression system maintains the switches off when the system is turned on until a charging circuit increases the gate voltage of the switches. The switches quickly turn off and the coupling capacitors are discharged through discharge resistors when the system is turned off.

US Patent:

20050052282, Mar 10, 2005

Filed:

Sep 3, 2004

Appl. No.:

10/934175

Inventors:

James Rodgers - Mesa AZ, US
John Coulthard - Scottsdale AZ, US
Billy Fowler - Phoenix AZ, US
Howard Jaecks - Mesa AZ, US
Roc Lastinger - Mesa AZ, US
Paul Picard - Mesa AZ, US
Mohammad Rehman - Chandler AZ, US

International Classification:

G08B013/14

US Classification:

340572100

Abstract:

A radio frequency identification device includes a transceiver having a resonant circuit, a rectifier, a charge pump, a state machine, and a transmitter. The resonant circuit includes an antenna and has a resonant frequency. The rectifier is coupled to the resonant circuit to provide a rectified signal in response to energy from the antenna. The charge pump is enabled in response to the rectified signal to provide a first logic signal. The state machine provides a second logic signal in response to the first logic signal. The transmitter includes an amplifier coupled to the resonant circuit to form a Colpitts oscillator that is enabled by the second logic signal to transmit a response signal for identifying the radio frequency identification device.

US Patent:

20100019820, Jan 28, 2010

Filed:

Jan 23, 2008

Appl. No.:

12/439618

Inventors:

Venkatesh P. Pai - Gilbert AZ, US
Mohammad Rehman - Chandler AZ, US
Umesh Jayamohan - Chandler AZ, US

International Classification:

H03H 11/26

US Classification:

327290

Abstract:

A low power monolithic CMOS device incorporating functions to control power supply transition noise such as in audio circuits and systems. The digital control circuit incorporates MOSFETs that are maintained in an OFF state during normal operation and are turned ON only when system power is turned on or off to thus eliminate the need for bias voltages and maintain minimal quiescent current.

US Patent:

6340932, Jan 22, 2002

Filed:

Jun 27, 2000

Appl. No.:

09/604180

Inventors:

James L. Rodgers - Mesa AZ
John J. Coulthard - Scottsdale AZ
Billy C. Fowler - Phoenix AZ
Howard K. Jaecks - Mesa AZ
Roc A. Lastinger - Mesa AZ
Paul A. Picard - Mesa AZ
Mohammad A. Rehman - Chandler AZ

Assignee:

RF Code, Inc. - Mesa AZ

International Classification:

G08B 1314

US Classification:

3405727, 3405728, 343700, 343872, 342 42

Abstract:

A carrier, as used for example to transport several radio frequency identification devices, includes a circuit having an antenna and a series capacitor for tuning the antenna. Enhanced transceiver communication results when transceivers are placed in the carrier. Alternately, a carrier may include first and second antenna circuits, each having a capacitor for tuning the respective antenna. The two circuits may cooperate so that energy received in a first pattern is re-radiated in a second pattern for further enhanced transceiver communication, such as detection of the presence of the RFID device within the carrier.