Issued Patents All Time
Showing 51–54 of 54 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7467351 | Layered master pages | David Spells, David Halpin | 2008-12-16 |
| 6942617 | Automatic stone-tracking system | Shen-Min Liang, Ioannis Manousakas, Yong-Ren Pu, Chien-Chen Chang, Chin-Hsing Chen | 2005-09-13 |
| 6771276 | Two-dimensional drawing environment utilizing perspective grids | Delores Highsmith, David Halpin | 2004-08-03 |
| 6459439 | Reshaping of paths without respect to control points | John B. Ahlquist, Jr., Douglas S. Benson, Steven R. Johnson, Brian T. Schmidt | 2002-10-01 |