Inventor
CHANG JOHN C H
US25 patents
⚠️ This page may combine multiple inventors who share the name “CHANG JOHN C H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
WALLACE COMPUTER SERVICES
22 patentsUS5427415AJun 27, 1995
Heat sensitive system and use thereof
WALLACE COMPUTER SERVICES81 citations96
US5612541AMar 18, 1997
Ultraviolet radiation monitoring device and use thereof
WALLACE COMPUTER SERVICES71 citations95
US5970875AOct 26, 1999
Pressure-sensitive tamper evident system
WALLACE COMPUTER SERVICES20 citations92
US5644352AJul 1, 1997
Multicolor heat-sensitive verification and highlighting system
WALLACE COMPUTER SERVICES71 citations92
US5618063AApr 8, 1997
Multicolor heat-sensitive verification and highlighting system
WALLACE COMPUTER SERVICES73 citations92
US5595955AJan 21, 1997
Verification method using pressure and heat-sensitive chromogenic system
WALLACE COMPUTER SERVICES23 citations92
US5401060AMar 28, 1995
Document with heat and pressure sensitive chromogentic composition thereon
WALLACE COMPUTER SERVICES22 citations92
US5395138AMar 7, 1995
Security document verification system with pressure-rupturable microcapsules
WALLACE COMPUTER SERVICES21 citations92
US5344191ASep 6, 1994
Hidden entry system and use thereof
WALLACE COMPUTER SERVICES30 citations92
US4425386AJan 10, 1984
Multi-sheet assembly using autogenous coating
WALLACE COMPUTER SERVICES48 citations92
US6060428AMay 9, 2000
Heat-sensitive chromogenic system
WALLACE COMPUTER SERVICES52 citations89
US5431452AJul 11, 1995
Hidden entry system and image-developing device therefor
WALLACE COMPUTER SERVICES33 citations89
US4846502AJul 11, 1989
Tamper evident document and use thereof
WALLACE COMPUTER SERVICES45 citations89
US4448445AMay 15, 1984
Pressure-sensitive record system
WALLACE COMPUTER SERVICES35 citations89
US5826915AOct 27, 1998
Method of using thermochromic material on security documents and product
WALLACE COMPUTER SERVICES41 citations87
US5898017AApr 27, 1999
Multicolor chromogenic system having improved image quality
WALLACE COMPUTER SERVICES15 citations74
US5759327AJun 2, 1998
Mailer printing method using ethylene vinyl acetate copolymer as a dual functional coating
WALLACE COMPUTER SERVICES7 citations74
US5605873AFeb 25, 1997
Pressure-sensitive verification system and use thereof
WALLACE COMPUTER SERVICES13 citations74
US5545459AAug 13, 1996
Business forms having dual-functional coating
WALLACE COMPUTER SERVICES12 citations74
US5536046AJul 16, 1996
Heat sensitive system and use thereof
WALLACE COMPUTER SERVICES14 citations74
US5880063AMar 9, 1999
Method of improving coverage of chromogenic reaction product
WALLACE COMPUTER SERVICES6 citations71
US5484169AJan 16, 1996
Hidden entry system and image-developing device therefor
WALLACE COMPUTER SERVICES12 citations70