Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6608896 | Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete Fourier transform | Matthew D. Felder, Brian Evans | 2003-08-19 |
| 6401075 | Methods of placing, purchasing and monitoring internet advertising | John Grant, Arnold Behrman, Dennis Stillwell | 2002-06-04 |
| 6370244 | Efficient digital ITU-compliant zero-buffering DTMF detection using the non-uniform discrete fourier transform | Matthew D. Felder, Brian Evans | 2002-04-09 |