Gang Liu

US Patent:

6486643, Nov 26, 2002

Filed:

Aug 27, 2001

Appl. No.:

09/813078

Inventors:

Gang Liu - Novi MI

Assignee:

Analog Technologies, Inc. - Farmington Hills MI

International Classification:

G05F 159

US Classification:

323268, 323274, 323284

Abstract:

An H bridge regulating system for driving an electric load includes a linear output stage and switch mode output stage connected to opposite ends of the load. The linear output stage has a linear mode amplifier and a feedback circuit, and its amplifier generates a first output signal tied to one end of the load. This output voltage is passed through a conditioning resistor to an inverting input of the linear mode amplifier. The switch mode output stage has a switch mode amplifier and a feedback circuit, and its amplifier generates a second output signal tied to the other end of the load. Its voltage signal is passed through a second conditioning resistor to an inverting input of the switch mode amplifier. Other feedback circuit elements are also provided to create three distinct regions of operations for each of the amplifiers. Due to this novel arrangement for an H bridge circuit, and this novel method of operation involving three distinct regions of operation for the linear mode and switch mode output stages, very high power-saving energy efficiencies are achieved.

US Patent:

6623075, Sep 23, 2003

Filed:

Mar 5, 2002

Appl. No.:

10/091243

Inventors:

Thomas Charles Baloga - Fort Mill SC
Gang Liu - Rock Hill SC

Assignee:

Britax Child Safety Inc. - Charlotte NC

International Classification:

B62J 100

US Classification:

2972501, 29721612

Abstract:

A child safety seat comprises a seat body having a seat portion and a backrest portion. A head restraint has a support portion secured to the backrest so as to project beyond the upper end thereof and a restraint portion immovably secured to the upper end of the support portion so as to project therefrom in a direction that remains generally parallel to the seat portion.

US Patent:

6636124, Oct 21, 2003

Filed:

Nov 30, 2001

Appl. No.:

10/000775

Inventors:

Gang Liu - Novi MI

Assignee:

Analog Technologies, Inc. - Sunnyvale CA

International Classification:

H03K 708

US Classification:

332109, 327172

Abstract:

A pulse width modulation (PWM) circuit has a PWM output signal that features accurate timing even in the face of interference imposed upon the control signal representative of the desired PWM duty cycle. The PWM circuit includes or has a first or switching section and a second or analog section. The second section has an operational amplifier with a summing circuit that sums two input signals, namely a triangular wave signal and the control input signal, and then amplifies the summed signal to produce a trapezoidal waveform output delivered to the second section. The first section features a two-input comparator that produces a PWM signal output with a fast transition in response to trapezoidal output fed as an input and compared to a stable reference signal. Due to the speed of the op amp, timing errors on the PWM output signal due to interference on the control signal are minimized.

US Patent:

6801557, Oct 5, 2004

Filed:

Apr 6, 2001

Appl. No.:

09/827764

Inventors:

Gang Liu - Novi MI 48375

International Classification:

H01S 300

US Classification:

372 3809, 372 3802, 372 3803, 372 3804, 372 3807

Abstract:

A laser driver for laser sensing system having two lasers on a single PCB, thermo-electric temperature control, rapid activation, and pulse power and duration safety tables embedded in the microprocessor controller.

US Patent:

20040008949, Jan 15, 2004

Filed:

Jun 21, 2002

Appl. No.:

10/176501

Inventors:

Gang Liu - Novi MI, US
Robert Rubock - Jefferson MD, US

International Classification:

G02B006/36

US Classification:

385/077000

Abstract:

A fiber optic connector comprises a body and a cable guide. The body comprises a first end for interfacing with a fiber optic transceiver and a second end for receiving a fiber optic cable. The body includes a passage from the first end of the body to the second end of the body for receiving the cable. The cable guide comprises a first end having a first inner perimeter and a second end having a second inner perimeter. The cable guide includes a passage from the first end of the cable guide to the second end of the cable guide for receiving the fiber optic cable. The first end of the cable guide is coupled to the second end of the body. The length of the first inner perimeter is less than the length of the second inner perimeter, thereby limiting bending of a portion of the fiber optic cable within and proximate the cable guide and allowing radial movement of the fiber optic cable within the cable guide.

US Patent:

62042939, Mar 20, 2001

Filed:

May 7, 1998

Appl. No.:

9/073807

Inventors:

Said M. Sebti - Tampa FL
Andrew D. Hamilton - Guilford CT
David J. Augeri - Kenosha WI
Kenneth J. Barr - Chicago IL
Stephen A. Fakhoury - Mundelein IL
David A. Janowick - Beach Park IL
Douglas M. Kalvin - Buffalo Grove IL
Stephen J. O'Connor - Wilmette IL
Saul H. Rosenberg - Grayslake IL
Wang Shen - Gurnee IL
Rolf E. Swenson - Grayslake IL
Bryan K. Sorensen - Waukegan IL
Gerard M. Sullivan - Round Lake Beach IL
Andrew S. Tasker - Simi Valley CA
James T. Wasicak - Waterford WI
Lissa T. J. Nelson - Highland Park IL
Kenneth J. Henry - Fishers IN
Le Wang - Mundelein IL
Gang Liu - Gurnee IL
Indrani W. Gunawardana - Libertyville IL

Assignee:

University of Pittsburgh - Pittsburgh PA

International Classification:

C07C26302
C07C30300
A61K 3138

US Classification:

514570

Abstract:

Compounds having the formula ##STR1## or a pharmaceutically acceptable salt thereof wherein R. sub. 1 is (a) hydrogen, (b) loweralkyl, (c) alkenyl, (d) alkoxy, (e) thioalkoxy, (f) halo, (g) haloalkyl, (h) aryl-L. sub. 2 --, and (i) heterocyclic-L. sub. 2 --; R. sub. 2 is selected from ##STR2## (b) --C(O)NH--CH(R. sub. 14)--C(O)OR. sub. 15, ##STR3## (d) --C(O)NH--CH(R. sub. 14)--C(O)NHSO. sub. 2 R. sub. 16, (e) --C(O)NH--CH(R. sub. 14)-tetrazolyl, (f) --C(O)NH-heterocyclic, and (g) --C(O)NH--CH(R. sub. 14)--C(O)NR. sub. 17 R. sub. 18 ; R. sub. 3 is heterocyclic, aryl, substituted or unsubstituted cycloalkyl; R. sub. 4 is hydrogen, lower alkyl, haloalkyl, halogen, aryl, arylakyl, heterocyclic, or (heterocyclic)alkyl; L. sub. 1 is absent or is selected from (a) --L. sub. 4 --N(R. sub. 5)--L. sub. 5 --, (b) --L. sub. 4 --O--L. sub.

US Patent:

60150645, Jan 18, 2000

Filed:

Dec 23, 1997

Appl. No.:

8/996860

Inventors:

Gang Liu - Novi MI

Assignee:

Analog Technologies, Inc. - Novi MI

International Classification:

B65D 124
B65D 8542

US Classification:

220524

Abstract:

A portable closable container has individually closable cells under a main lid. The container has a base with which the main lid defines an internal space. The internal space is partially filled by a plurality of side-by-side, top-to-bottom individual cells. Each of the cells is fitted with a removable cover which is hingedly mounted to the cell. The removable cover of the cell includes a tab for manipulation by the user's finger. A space is provided for a label on the cover of the cell. The components of the container are preferably composed of a polymerized material, such as polypropylene. There are two slots on the main lid which match the two feet on the base. These slots and the feet allow one container of the same kind to be stacked on the top of another without one shifting with respect to the other away from each other.

US Patent:

60468017, Apr 4, 2000

Filed:

Dec 23, 1997

Appl. No.:

8/997440

Inventors:

Gang Liu - Novi MI
Mark H. Schwartz - Orchard Lake MI

Assignee:

Analog Technologies, Inc. - Farmington Hills MI

International Classification:

G01N 2116

US Classification:

3562371

Abstract:

A laser-based optical inspection system is provided for detecting and measuring surface imperfections and warpage conditions in an optical information storage disk either during its manufacture or afterwards. The optical inspection system includes a light source, a rotatable mirror for directing a source beam from the light source along a radial line on the surface of the disk, a convex lens positioned between the mirror and the disk for focusing the source beam at the surface of said disk, and a photodetector for registering a beam being reflected from the surface of said disk, such that the reflected beam is indicative of surface imperfections in said disk. In addition, an electronic processor and controller are connected to the photodetector for processing its registered beam signals and for determining if the disk surface imperfections exceeds specified tolerances. Furthermore, the processor may be used to control other system components, including the light source, the actuator device for rotating the mirror, and the drive motor for rotating the disk during the inspection process. These results about the warpage and any surface imperfection of the disk can be displayed on the monitor of the computer to inform the machine operator as well as sent to other related manufacturing machines for further usage.