Inventor
PAN ZAI-AN
CN9 patents
⚠️ This page may combine multiple inventors who share the name “PAN ZAI-AN”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
HONGFUJIN PREC IND SHENZHEN
3 patentsUS8047132B2Nov 1, 2011
Method for affixing a seal impression on a paper document and hand-held device using the same
HONGFUJIN PREC IND SHENZHEN2 citations62
US7796778B2Sep 14, 2010
Digital watermarking system according to background image pixel brightness value and digital watermarking method
HONGFUJIN PREC IND SHENZHEN2 citations60
US7796777B2Sep 14, 2010
Digital watermarking system according to matrix margin and digital watermarking method
HONGFUJIN PREC IND SHENZHEN1 citations49