Patents per Year
Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date | Approx Value ⓘ |
|---|---|---|---|---|
| 6891541 | Graphing calculator with manual line drawing | — | 2005-05-10 | $25,858,000 |
| 5481899 | Pressure differential downset apparatus | Duane Callaway, Rajesh Shah | 1996-01-09 | $5,653,000 |
| 5338705 | Pressure differential downset | Duane Callaway, Rajesh Shah | 1994-08-16 | $4,904,000 |