Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8983182 | System and method for estimating continuous tone values from rendered binary input | Xing Li, David J. Metcalfe | 2015-03-17 |
| 7627188 | Error diffusion method and hardware architecture | David J. Metcalfe, Zhenhuan Wen | 2009-12-01 |
| 7460727 | Error diffusion method and hardware architecture | David J. Metcalfe, Zhenhuan Wen | 2008-12-02 |
| 5282053 | Scan image processing | — | 1994-01-25 |
| 5162916 | Compact read/write scanner | Denis J. Stemmle | 1992-11-10 |
| 5081475 | Vertical line width control ionographic system | John A. Frank, Brendan C. Casey | 1992-01-14 |
| 5077614 | Scanner with document and copy sheet registration means | Denis J. Stemmle | 1991-12-31 |