James Stewart Rodgers

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.

US Patent:

6351215, Feb 26, 2002

Filed:

Jan 20, 1999

Appl. No.:

09/233755

Inventors:

James L. Rodgers - Mesa AZ
Billy C. Fowler - Phoenix AZ
Howard K. Jaecks - Mesa AZ

Assignee:

RF Code, Inc. - Mesa AZ

International Classification:

G08B 1314

US Classification:

3405721, 3405727, 343745, 343748, 343893, 343894

Abstract:

A monitoring system incorporates antennas that transmit signals at predetermined frequencies; the transmitted signals are received by tags located in the active monitoring area of the antenna which then transmit signals back to the antenna. The antennas are tuned to each desired frequency prior to driving the antennas to transmit at the desired frequency. The system transmits a range of frequencies in a sequence that uses overlapping frequency steps. The monitoring system is also constructed having a variable configuration resulting in the ability to be reconfigured under program control to conform to varying system requirements. The integrated monitoring system employs programmable formats for reconfiguration such that upon program input from a host computer the system can assume predetermined configurations to conform to the particular tasks for the specific application. The monitoring system incorporates an antenna system that employs digitally controlled, differentially driven, scanning transceivers, and walk through magnetic induction antennas positionable in various configurations to maximize detection of tags being transported through the antenna system.

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:

6396005, May 28, 2002

Filed:

Mar 1, 2001

Appl. No.:

09/797407

Inventors:

James L. Rodgers - Mesa AZ
Howard K. Jaecks - Mesa AZ
Billy C. Fowler - Phoenix AZ

Assignee:

Rodgers Technology Center, Inc. - Tempe AZ

International Classification:

G08C 2100

US Classification:

178 1801, 178 1901

Abstract:

A grid consists of a first serpentine, and a second serpentine overlapping the first serpentine. Signals from the first and second serpentines are analyzed to determine transducer position. The first and second serpentines are foldback serpentines. The first serpentine is offset from the second serpentine by approximately ninety degrees.

US Patent:

6621410, Sep 16, 2003

Filed:

Oct 2, 1999

Appl. No.:

09/410897

Inventors:

Roc A. Lastinger - Mesa AZ
James L. Rodgers - Mesa AZ
John J. Coulthard - Scottsdale AZ
Robert P. Ufford - Roswell GA

Assignee:

RF Code, Inc. - Mesa AZ

International Classification:

G01S 1302

US Classification:

340 1042, 340 101, 3405727

Abstract:

A system includes an identification circuit, a grid antenna, a receiver, and a processor. The identification circuit includes resonant circuits formed on a substrate within a perimeter. Identification may be based on a quantity or physical arrangement of detected resonant circuits within the perimeter. One resonant circuit provides a reference signal. Any resonant circuit may be tuned in accordance with the reference signal by the addition or subtraction of reactance formed on the substrate. A capacitance of a first group of capacitors located outside a turn of an inductor is roughly equal to a capacitance of a second group of capacitors located inside the turn. Any resonant circuit may also be tuned by affixing a resonance modifying element, for example a sticker, to the identification circuit. The grid antenna provides antenna field patterns, one for each cell location. The receiver communicates with the identification circuit via the grid antenna.

US Patent:

6665555, Dec 16, 2003

Filed:

Apr 5, 2001

Appl. No.:

09/826000

Inventors:

Fraser C. Henderson - Washington DC
James Rodgers - Washington DC
Azam Niroomand-Rad - Washington DC
Kevin Cleary - Washington DC
Anatoly Dritschilo - Washington DC
Leon Der - Washington DC

Assignee:

Georgetown University School of Medicine - Washington DC

International Classification:

A61B 505

US Classification:

600427, 128899, 378 64, 378 65, 600425, 600473, 600476, 600 1, 600 2, 600 3

Abstract:

A system for delivery of high dosage of radiation to a targeted spinal area is provided. This is accomplished by a system which provides for precise immobilization and positioning of the treated spinal area during dose planning and treatment via stereotactic radiosurgery. Advantages of the system include convenience to the patient, enhanced efficacy, and reduced risk of radiotoxicity to non-target tissues.

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.