Issued Patents All Time
Showing 26–50 of 94 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9075020 | Gas activated changes to light absorption and emission characteristics for security articles | — | 2015-07-07 |
| 8961702 | Supercritical fluid cleaning of banknotes and secure documents | — | 2015-02-24 |
| 8932409 | Supercritical fluid cleaning of banknotes and secure documents | — | 2015-01-13 |
| 8931701 | Methods and systems for authenticating and tracking objects | — | 2015-01-13 |
| 8840029 | Multi wavelength excitation/emission authentication and detection scheme | Andrei Smuk, Leif Olson, Charles M. Zepp | 2014-09-23 |
| 8530863 | Fluorescence notch coding and authentication | — | 2013-09-10 |
| 8491186 | Currency fitness and wear detection using temperature modulated infrared detection | — | 2013-07-23 |
| 7963450 | Near infrared ink security feature | Tim Driscoll, Jeff Conroy, William Goltsos, Charles M. Zepp | 2011-06-21 |
| 7760421 | Method and apparatus for enhancing plasmon polariton and phonon polariton resonance | — | 2010-07-20 |
| 7684035 | Chemical and biological sensing using metallic particles in amplifying and absorbing media | — | 2010-03-23 |
| 7529385 | Marking articles using a covert digitally watermarked image | Jeffrey L. Conroy, Andrei Smuk | 2009-05-05 |
| 7504137 | Limited play optically-readable medium with liquid crystals and methodology therefor | Robert Afzal, Jeffrey L. Conroy | 2009-03-17 |
| 7393623 | Incorporation of markings in optical media | Jeffrey L. Conroy, Robert Afzal, Allison Berube, Dana Lewis, Thomas Pizzuti +1 more | 2008-07-01 |
| 7355704 | Chemical and biological sensing using metallic particles in amplifying and absorbing media | — | 2008-04-08 |
| 7220535 | Marking and authenticating articles | Jeffrey L. Conroy, Robert Afzal, Allison Berube, Charles M. Zepp, Andrei Smuk | 2007-05-22 |
| 7184569 | Marking articles using a covert digitally watermarked image | Jeffrey L. Conroy, Andrei Smuk | 2007-02-27 |
| 7119161 | Anisotropic nanoparticles and anisotropic nanostructures and pixels, displays and inks using them | — | 2006-10-10 |
| 6948068 | Method and apparatus for reading digital watermarks with a hand-held reader device | John A. Moon | 2005-09-20 |
| 6908505 | Thermochromic compositions of color formers and lewis acids | Timothy James Driscoll, Charles M. Zepp | 2005-06-21 |
| 6881915 | Contrast enhancing marking system for application of unobtrusive identification and other markings | Timothy James Driscoll, Charles M. Zepp | 2005-04-19 |
| 6874639 | Methods and apparatus employing multi-spectral imaging for the remote identification and sorting of objects | — | 2005-04-05 |
| 6832783 | Optically-based methods and apparatus for performing sorting, coding and authentication using a gain medium that provides a narrowband emission | — | 2004-12-21 |
| 6795464 | Temperature control of laser action in scattering media | — | 2004-09-21 |
| 6780564 | Methods and apparatus for rendering an optically encoded medium unreadable and tamper-resistant | Charles M. Zepp, Andrei Smuk, Marianne Krieg-Kowald | 2004-08-24 |
| 6709802 | Methods and apparatus for rendering an optically encoded medium unreadable | Charles M. Zepp, Kenneth S. Norland | 2004-03-23 |