Kefeng Zeng

US Patent:

7912661, Mar 22, 2011

Filed:

Feb 23, 2007

Appl. No.:

11/710294

Inventors:

Kefeng Zeng - Mantua NJ, US
Keat Ghee Ong - Houghton MI, US
Xiping Yang - Dallas TX, US
Craig A. Grimes - Boalsburg PA, US

Assignee:

KMG2 Sensors Corporation - Boalsburg PA

International Classification:

G01R 23/16

US Classification:

702 76, 702 56, 702189, 324 7611, 324600

Abstract:

Circuitry and program code adapted for carrying out an associated technique for characterizing the response of one or more magnetoelastic sensor elements during exposure to an excitation field generated by an interrogation coil: including: (a) measuring a total sensor signal from the coil with the sensor element positioned within the excitation field within a spacing created by a winding of the coil; and (b) automatically determining: (i) a total measured impedance spectrum from said total sensor signal so measured, and (ii) a plurality of magnitude values representing the real part of a reconstructed impedance spectrum for the sensor element. The reconstructed impedance spectrum for the sensor element, having been calculated by subtracting an impedance generally attributable to the coil during the time an AC excitation signal is provided, from the total measured impedance. Subtraction of coil impedance from total complex impedance is accomplished by separate subtraction of the real part and of the imaginary part, represented as follows(ω)]=(ω)]−(ω)]  Equation (12)and(ω)]=(ω)]−(ω)]  Equation (13)where subscript “t” indicates total complex impedance, “s” indicates sensor element impedance, and “c” indicates coil impedance.

US Patent:

8587489, Nov 19, 2013

Filed:

Jun 6, 2008

Appl. No.:

12/134827

Inventors:

Harry Oung - Cherry Hill NJ, US
Kefeng Zeng - Mantua NJ, US

Assignee:

Checkpoint Systems, Inc. - Thorofare NJ

International Classification:

H01Q 7/08
H01Q 11/18
H01Q 21/00
G08B 13/22

US Classification:

343742, 343788, 343867, 3405727

Abstract:

This invention relates to dynamically controlled, electronic article surveillance (EAS) systems whereby an array of antenna elements is digitally phased and actively driven for concurrent transmission, and digitally phased and combined in the receiver unit to improve security tag detection. In particular, the individual frequency and phase of the plurality of the transmit/receive signals are rapidly varied to allow for automated manipulation (steering) of the transmit field pattern and receive field sensitivity. It is the object of this invention to achieve the following features via means of digital phasing and dynamic computer control: sufficient far-field cancellation, null-free detection and uncompromised detection performance regardless of tag's orientation.

US Patent:

20060064259, Mar 23, 2006

Filed:

Sep 8, 2004

Appl. No.:

10/936125

Inventors:

Kefeng Zeng - State College PA, US
Keat Ong - State College PA, US
Craig Grimes - Boalsburg PA, US

International Classification:

G06F 19/00

US Classification:

702070000

Abstract:

Circuitry adapted for carrying out associated techniques for: (a) calculating a damping factor, e.g., a damping ratio represented by ζ, or a quality factor Q, where ζ≈1/2Q, for a transient signal received, having been emitted from a resonator-type sensor element; (b) determining amplitude, A, of the transient signal; or (c) generating a frequency response dataset of interrelated points for the transient signal. A threshold comparison circuit is included for converting the transient signal received into a first and second digital waveform; the first digital waveform represents cycle crossings of the transient signal associated with a first threshold value, and the second digital waveform represents cycle crossings of the transient signal associated with a second threshold value. The transient signal may be converted, likewise, into third, and so on, digital waveforms, whereby the third digital waveform represents cycle crossings of the transient signal associated with a third threshold value. Respective digital counters are included, each of which is adapted for determining a total number of cycles of the first, second, third, and so on, digital waveform. A processing unit of suitable speed and capacity is employed for the calculating of the damping factor, determining an amplitude, and/or generating a frequency response dataset.

US Patent:

20080261261, Oct 23, 2008

Filed:

Apr 2, 2008

Appl. No.:

12/080472

Inventors:

Craig A. Grimes - Boalsburg PA, US
Kefeng Zeng - Mantua NJ, US
Keat Ghee Ong - Houghton MI, US
Xiping Yang - Dallas TX, US

International Classification:

C12Q 1/02
C12M 1/00

US Classification:

435 29, 4352871

Abstract:

A system/analyzer-unit and method/platform—using information obtained from at least one, adapted for a plurality of, magnetoelastic sensor elements in contact with one or more samples comprising blood from a patient—for automatically quantifying one or more parameters of the patient's blood. Information obtained from emissions measured from each of the sensor elements is uniquely processed to determine a quantification about the patient's blood, such as, quantifying platelet aggregation to determine platelet contribution toward clot formation; quantifying fibrin network contribution toward clot formation; quantifying platelet-fibrin clot interactions; quantifying kinetics of thrombin clot generation; quantifying platelet-fibrin clot strength; and so on. Structural aspects of the analyzer-unit include: a cartridge having at least one bay within which a sensor element is positioned; each bay in fluid communication with both (a) an entry port for injecting a first blood sample composed of blood taken from the patient (human or other mammal), and (b) a gas vent through which air displaced by injecting the first blood sample into the bay.

US Patent:

20090261976, Oct 22, 2009

Filed:

Apr 30, 2009

Appl. No.:

12/433375

Inventors:

Harry Oung - Cherry Hill NJ, US
Kefeng Zeng - Mantua NJ, US

Assignee:

Checkpoint Systems, Inc. - Thorofare NJ

International Classification:

G08B 13/22

US Classification:

3405722

Abstract:

This invention relates to dynamically controlled, electronic article surveillance (EAS) systems whereby an array of antenna elements is digitally phased and actively driven for concurrent transmission, and digitally phased and combined in the receiver unit to improve detection. In particular, the individual frequency and phase of the plurality of the transmit/receive signals are rapidly varied to allow for automated manipulation (steering) of the transmit field pattern and receive field sensitivity. The invention achieves the following features via means of digital phasing and dynamic computer control: sufficient far-field cancellation, null-free detection and uncompromised detection performance regardless of tag's orientation while using single transmission drivers to drive entire antenna structures, whether loop antenna or ferrite core antenna, using a phase coupler, thereby allowing more efficient system operation or additional features such as deactivator antenna operation.

US Patent:

20120212343, Aug 23, 2012

Filed:

Feb 17, 2012

Appl. No.:

13/399091

Inventors:

Lothar Grunenberg - Heppenheim, DE
Nimesh Shah - Marlton NJ, US
Kefeng Zeng - West Deptford NJ, US

Assignee:

CHECKPOINT SYSTEMS, INC. - Philadelphia PA

International Classification:

G08B 13/14
G06K 7/01

US Classification:

3405723, 340 105

Abstract:

A system and method for automatically deactivating a security tag upon entry into business establishment to prevent tag pollution. The system and method involve positioning a security tag deactivator at an entrance of a business establishment and emitting an EM field sufficient to deactivate any security tag that enters into the business establishment.

US Patent:

20220262220, Aug 18, 2022

Filed:

Jul 21, 2020

Appl. No.:

17/628718

Inventors:

Nimesh SHAH - Cherry Hill NJ, US
- Shanghai, CN
Zhihao YANG - Shanghai, CN
Benjamin RUBINSTEIN - Thorofare NJ, US
Kefeng ZENG - Thorofare NJ, US

International Classification:

G08B 13/24
G09G 3/20
G06K 7/10

Abstract:

An advertising display unit based on an anti-theft antenna includes an antenna body and an antenna panel installed on the antenna body. The antenna panel includes a front side and a reverse side. The antenna panel includes a display screen on one of the front side or reverse side. The display screen may be an LED screen or LCD screen. The display screen may be opaque or transparent.

US Patent:

20170162952, Jun 8, 2017

Filed:

Dec 3, 2015

Appl. No.:

14/958543

Inventors:

- Thorofare NJ, US
Kefeng Zeng - West Deptford NJ, US

International Classification:

H01Q 21/30

Abstract:

In one embodiment, the invention can be a radio frequency identification (RFID) tag including a substrate; a dipole antenna on the substrate; a first loop antenna on the substrate; a first integrated circuit operably coupled to the first loop antenna; a second loop antenna on the substrate; and a second integrated circuit operably coupled to the second loop antenna; wherein the first loop antenna is operatively coupled to the dipole antenna and the first integrated circuit to operate at a first resonant frequency, and the second loop antenna is operatively coupled to the dipole antenna and the second integrated circuit to operate at a second resonant frequency, the first resonant frequency being different from the second resonant frequency.