Changwei Liu

City:

Beijing

Country:

China

Published Applications:

Last publication date:

2013-07-04

Top Assignees for applications by Changwei Liu

The entities that hold a legal rights for patent applications filed by inventor Liu Changwei:

SURSEN CORP. 8 Beijing, China
Sursen Corporation 2 Tianjin, China
Beijing Sursen International Information Tech Co. 1 Beijing, China

Recent patent applications by Liu Changwei

Changwei Liu from Beijing, CN has applied for patents for these inventions. The list has both pending applications and granted patents:

#1 | 2013-07-04

US20130174268A1

Physics

METHOD AND SYSTEM FOR DOCUMENT DATA SECURITY MANAGEMENT

#2 | 2013-01-31

US20130028466A1

Physics

Embedding and detecting hidden information

#3 | 2012-07-05

US20120173964A1

Physics

Method and system for processing document on layers

#4 | 2009-12-24

US20090320141A1

Physics

DOCUMENT DATA SECURITY MANAGEMENT METHOD AND SYSTEM THEREFOR

#5 | 2009-07-23

US20090187604A1

Physics

Docbase management system and method for extending docbase management system and functions

#6 | 2008-12-18

US20080310672A1

Physics

Embedding and detecting hidden information

#7 | 2008-10-30

US20080270464A1

Physics

Document processing system and method therefor

#8 | 2008-10-30

US20080270463A1

Physics

DOCUMENT PROCESSING SYSTEM AND METHOD THEREFOR

#9 | 2008-10-23

US20080263333A1

Physics

DOCUMENT PROCESSING METHOD

#10 | 2008-10-23

US20080263068A1

Physics

Method of hierarchical processing of a document and system therefor

InventorID:

64993 ⎘