Douden; David K.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Douden; David K..The latest application filed is for "method of making thin silica flakes".
- Douden; David K. - St. Paul MN
- Douden; David K. - Richfield MN
| Patent | Date |
|---|---|
| Method of making thin silica flakes Grant 5,104,632 - Douden , et al. April 14, 1 | 1992-04-14 |
| Thin silica flakes and method of making Grant 4,971,697 - Douden , et al. November 20, 1 | 1990-11-20 |
| Fired hollow ceramic spheroids Grant 4,657,810 - Douden April 14, 1 | 1987-04-14 |
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