Perry Y Li, 5917525 29Th St, Minneapolis, MN 55447

7209228, Apr 24, 2007

Nov 12, 2003

10/712802

Perry Y. Li - Roseville MN, US
Chuanqi Chen - Minnetonka MN, US
Arthur G. Erdman - New Brighton MN, US
Zhang Hong - Minneapolis MN, US
John Byron Raymond - Lakeville MN, US

G01N 21/01
A61F 1/12
A61B 19/00

356244, 606130, 606107

A scanning apparatus includes a support frame and a laser scanner mounted to the frame. A five bar closed loop spherical linkage supports a clamping device for retaining an object. The linkage moves the object through a scanning beam about a spherical surface to facilitate scanning of curved objects. The linkage is mounted on an arm rotatably mounted to the frame and the clamping device is rotatably mounted to the linkage to provide four degrees of freedom. Encoders and motors drive the linkage to provide accurate positioning and providing for digitizing the scanned object.

8286939, Oct 16, 2012

Oct 10, 2007

12/444910

Perry Y. Li - Plymouth MN, US
Thomas R. Chase - Minneapolis MN, US

Regents of the University of Minnesota - Minneapolis MN

F16K 5/10

251290, 251208, 251205

A pulse width modulated fluidic valve includes a cylinder () having an elongate bore, a length, and first () and second () ports which extend from outside the cylinder () into the bore. A rotatable spool () is carried in the bore and movable in a direction of the length of cylinder (). The spool () has a variable blocking feature () which blocks passage of fluid' between the first () and second () ports as a function of angular position relative to the first () and second () ports and as a function of linear position along the length of the cylinder ().

8413436, Apr 9, 2013

Oct 10, 2007

12/445176

Perry Y. Li - Plymouth MN, US
James D. Van de Ven - Paxton MA, US

Regents of the University of Minnesota - Saint Paul MN

F15B 1/00

60415, 60418

An accumulator system is configured to store energy and includes an accumulator having a liquid chamber coupled to a liquid port and an air chamber coupled to an air port. The liquid chamber and the air chamber are separated by a moveable isolation barrier. An air motor/compressor coupled to the air port is configured to receive a mechanical input and responsively pump air into the accumulator, and to receive pressurized air from the air port and responsively provide a mechanical output. A liquid reservoir is coupled to the liquid port to receive liquid from the liquid chamber as air is pumped into the air chamber and to provide liquid to the liquid chamber as air is removed from the air chamber.

2003002, Jan 30, 2003

Oct 25, 1999

09/426385

PERRY Y. LI - ROSEVILLE MN, US
CHUANQI CHEN - MINNETONKA MN, US
ARTHUR G. ERDMAN - NEW BRIGHTON MN, US
ZHANG HONG - MINNEAPOLIS MN, US
JOHN BYRON RAYMOND - LAKEVILLE MN, US

G01N021/01

356/244000

A scanning apparatus includes a support frame and a laser scanner mounted to the frame. A five bar closed loop spherical linkage supports a clamping device for retaining an object. The linkage moves the object through a scanning beam about a spherical surface to facilitate scanning of curved objects. The linkage is mounted on an arm rotatably mounted to the frame and the clamping device is rotatably mounted to the linkage to provide four degrees of freedom. Encoders and motors drive the linkage to provide accurate positioning and providing for digitizing the scanned object.

2008008, Apr 10, 2008

Oct 10, 2006

11/545715

Perry Y. Li - Maple Grove MN, US
Thomas R. Chase - Minneapolis MN, US

F16K 31/02

25112905

A pulse width modulated fluidic valve includes a cylinder having an elongate bore, a length and first and second ports which extend from outside the cylinder into the bore. A rotatable spool is carried in the bore and movable in a direction of the length of cylinder. The spool has a variable blocking feature which blocks passage of fluid between the first and second ports as a function of angular position relative to the first and second ports and as a function of linear position along the length of the cylinder.

6021285, Feb 1, 2000

May 22, 1998

9/083141

Lingappa K. Mestha - Fairport NY
Sohail A. Dianat - Pittsford NY
Yao Rong Wang - Webster NY
Perry Y. Li - Minneapolis MN
Michael J. Rice - Webster NY

Xerox Corporation - Stamford CT

G06G 1500
G06G 15043
G06G 1508

399 9

An image quality control apparatus controls quality of xerographic images formed by a xerographic imaging system onto a recording medium when at least one sensor which is operative to provide signals to the xerographic imaging system for quality control malfunctions. The image quality control apparatus includes a controller device in communication with the xerographic imaging system. The controller includes a data collection device, a determining device and an input generating device. The data collection device collects and processes sensor data received from the at least one sensor while the at least one sensor is operative. The determining device determines whether the at least one sensor malfunctions. The input generating device generates a controller input signal by using the sensor data collected by the data collection device and provides the controller input signal to the xerographic imaging system to control quality of the xerographic images when the determining device determines that the at least one sensor has malfunctioned. A method for controlling quality of a xerographic print after malfunction of a quality control sensor is also described.

6322069, Nov 27, 2001

Mar 12, 1999

9/267029

Martin Krucinski - Webster NY
Carlo Cloet - Berkeley CA
Masayoshi Tomizuka - Berkeley CA
Roberto Horowitz - El Cerrito CA
Sudhendu Rai - Penfield NY
David R. Kamprath - Webster NY
Perry Y. Li - Minneapolis MN

Xerox Corporation - Stamford CT

B65H 534

27126502

A method of synchronizing the arrival of copy sheets at a photoreceptor in an image processing having a copy sheet path having a plurality of segments coupled at given transfer zones, a plurality of copy sheet drives, an image transfer station, a photoreceptor and a controller. The controller directs the image processing apparatus by tracking the movement of copy sheets at the image transfer station in relation to the movement of the photoreceptor, monitoring the movement of copy sheets at the transfer zones, determining the need to adjust the spacing of copy sheets along the plurality of segments of the copy sheet path, and suitably activating selected copy sheet drives.

2020024, Aug 6, 2020

Feb 4, 2020

16/781446

- Minneapolis MN, US
Perry Yan-Ho Li - Minneapolis MN, US

F15B 21/14
F04B 17/03

A device having a hybrid hydraulic-electric architecture includes a hydraulic pump/motor having first and second ports, and an electric motor. The device is configured to connect to two or more pressure rails, each pressure rail containing hydraulic fluid at a different pressure than the other pressure rails. A flow of hydraulic fluid from one of the pressure rails is driven through the hydraulic pump/motor, and a pressure difference exists between the first and second ports. The electric motor is configured to control a flow rate of the flow of hydraulic fluid and/or the pressure difference.