Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6060428 | Heat-sensitive chromogenic system | John C. H. Chang, Ronald R. Garrison, Derrick Kraus | 2000-05-09 |
| 5970875 | Pressure-sensitive tamper evident system | John C. H. Chang | 1999-10-26 |
| 5874142 | Linerless adhesive-equipped carrier assembly and method | — | 1999-02-23 |
| 5612541 | Ultraviolet radiation monitoring device and use thereof | John C. H. Chang | 1997-03-18 |
| 5587222 | Label assembly with multi-ply insert | — | 1996-12-24 |
| 5562789 | Label-equipped web method | — | 1996-10-08 |
| 5484169 | Hidden entry system and image-developing device therefor | John C. H. Chang | 1996-01-16 |
| 5431452 | Hidden entry system and image-developing device therefor | John C. H. Chang | 1995-07-11 |
| 5421942 | Label-equipped web method | — | 1995-06-06 |
| 5271787 | Method of making and using a label-equipped form | Wayne E. Richter | 1993-12-21 |
| 5254381 | Label-equipped sheet | Joseph J. Juszak | 1993-10-19 |