Patent US 5142617A
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| Patent number | US 5142617A (click link for details and documents via Google Patents) |
|---|---|
| Title | Method of shading a graphics image |
| Inventors | John C. Dalrymple, V. B. Sureshkumar |
| Company | Tektronix Inc |
| Filing date | 1988-10-27 |
| Grant date | 1992-08-25 |