Inventor

QI WENFA

CN4 patents

⚠️ This page may combine multiple inventors who share the name “QI WENFA”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

QI WENFA

2 patents

US8976383B2Mar 10, 2015

Method and system for document printing management and control, and document source tracking

QI WENFA3 citations55

US8120795B2Feb 21, 2012

Method of document protection

QI WENFA5 citations52

YANG BIN

1 patent

US8107129B2Jan 31, 2012

Methods and apparatus for embedding and detecting digital watermarks in a text document

YANG BIN7 citations80

WANG GAOYANG

1 patent

US9111341B2Aug 18, 2015

Watermarking image block division method and device for western language watermarking processing

WANG GAOYANG1 citations43