Issued Patents All Time
Showing 51–60 of 60 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7251077 | Diffuse reflector and method | Kenneth John Drinkwater | 2007-07-31 |
| 7054042 | Optically variable security device | Kenneth John Drinkwater, Ralph Kay | 2006-05-30 |
| 6903850 | Security device | Ralph Kay | 2005-06-07 |
| 6822769 | Security device | Kenneth John Drinkwater | 2004-11-23 |
| 6753989 | Recording surface relief microstructure | John David Wiltshire | 2004-06-22 |
| 6369919 | Holographic security device | Kenneth John Drinkwater | 2002-04-09 |
| 6089614 | Security device | Paul Howland, Kenneth John Drinkwater | 2000-07-18 |
| 5694229 | Holographic security device | Kenneth John Drinkwater | 1997-12-02 |
| 5483363 | Security device | Kenneth John Drinkwater, David Ezra, Jon Andreassen | 1996-01-09 |
| 4346800 | Apparatus for turning over conveyed articles | John D. Bennett, David C. Morton | 1982-08-31 |