Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6527080 | Passive system for speech enhancement | Keng D. Hsueh, Peter Didyk | 2003-03-04 |
| 5917530 | Dye diffusion thermal transfer printing | Kenneth West Hutt, Ian Richard Stephenson, Ha Cong Viet Tran, Richard A. Hann, Alan J. Harry +1 more | 1999-06-29 |
| 5582924 | Magnetic materials for security applications | — | 1996-12-10 |
| 5455563 | Magnetic marker and method for modifying the magnetic properties thereof | Stephen H. Chambers | 1995-10-03 |
| 5368948 | Magnetic materials for security applications | — | 1994-11-29 |
| 5345222 | Detection apparatus for security systems | Leif sbrink | 1994-09-06 |
| 5175499 | Systems and markers using magnetic or spin resonance phenomena | — | 1992-12-29 |
| 4960651 | Magnetic devices | Robert M. Pettigrew, Stephen H. Chambers | 1990-10-02 |
| 4940966 | Article detection and/or recognition using magnetic devices | Robert M. Pettigrew, Stephen H. Chambers, Michael D. Crossfield | 1990-07-10 |