Issued Patents All Time
Showing 1–7 of 7 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6784796 | Magnetic vector field tag and seal | Roger G. Johnston | 2004-08-31 |
| 6588812 | Enhanced tamper indicator | Roger G. Johnston | 2003-07-08 |
| 6553930 | Tamper-indicating device having a glass body | Roger G. Johnston | 2003-04-29 |
| 6394022 | Triboluminescent tamper-indicating device | Roger G. Johnston | 2002-05-28 |
| 6293163 | Fluid sampling tool | Roger G. Johnston, Ronald K. Martinez | 2001-09-25 |
| 6065488 | Fluid sampling tool | Roger G. Johnston, Ronald K. Martinez | 2000-05-23 |
| 5907110 | Fluid sampling tool | Roger G. Johnston, Ronald K. Martinez | 1999-05-25 |