Chen H Chen

US Patent:

20110052921, Mar 3, 2011

Filed:

Aug 5, 2010

Appl. No.:

12/851040

Inventors:

Weiliang GONG - Rockville MD, US
Werner LUTZE - Chevy Chase MD, US
Chen CHEN - Washington DC, US
Ian PEGG - Alexandria VA, US

International Classification:

B32B 9/00
G01N 33/00

US Classification:

428426, 436145, 428689, 428446, 428454

Abstract:

Provided in one embodiment is a method of charactering a fly ash composition, comprising determining a reactivity of the fly ash composition in a solution. The applicability of the findings to low water-to-solid ratios for the process of geopolymerization for the relationship between the amounts of fly ash reacted, and the compressive strength of a geopolymer cement is also described.

US Patent:

20230010350, Jan 12, 2023

Filed:

Dec 17, 2019

Appl. No.:

17/777761

Inventors:

- Mansfield MA, US
Steven J. Levine - Framingham MA, US
Albert Dvornik - Somerville MA, US
Mantena V. Raju - Medford MA, US
Chen Chen - Malden MA, US

International Classification:

A61B 34/37
A61B 90/00
A61B 34/00

Abstract:

( robotic surgical system with user engagement monitoring includes a surgeon console having a hand detection system and a tracking device including an image capture device configured to capture an image of a user position reference point, wherein information from the hand detection system and the tracking device are combined to control operation of the robotic surgical system.

US Patent:

20190327124, Oct 24, 2019

Filed:

Jun 19, 2019

Appl. No.:

16/446589

Inventors:

- Greenbelt MD, US
David N. Claffey - Somerville MA, US
Chen Chen - Burlingame CA, US
Feng Zhang - Greenbelt MD, US
Chenshu Wu - Greenbelt MD, US
Chau-Wai Wong - Raleigh NC, US
Beibei Wang - Clarksville MD, US
Oscar Chi-Lim Au - San Jose CA, US
K. J. Ray Liu - Potomac MD, US

Assignee:

ORIGIN WIRELESS, INC. - Greenbelt MD

International Classification:

H04L 27/36
H04B 1/38
H04W 72/04

Abstract:

Method, apparatus and systems for object tracking are disclosed. In one example, a system for tracking a plurality of objects in a venue is disclosed. The system comprises a transmitter configured for transmitting a series of probe signals in a broadcasting manner through a wireless multipath channel, wherein the wireless multipath channel is impacted by a movement of at least one of the plurality of objects in the venue; and a plurality of heterogeneous target wireless receivers each of which is associated with an object of the plurality of objects in the venue. Each of the plurality of heterogeneous target wireless receivers is configured for: receiving the series of probe signals through the wireless multipath channel between the heterogeneous target wireless receiver and the transmitter, obtaining at least one time series of channel information (TSCI) of the wireless multipath channel based on the series of probe signals received by the heterogeneous target wireless receiver, and tracking the object associated with the heterogeneous target wireless receiver based on the at least one TSCI.