Steffenhagen; Debra M.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Steffenhagen; Debra M..The latest application filed is for "method and apparatus for thin film coating an article".
- Steffenhagen; Debra M. - Faribault MN
| Patent | Date |
|---|---|
| Method and apparatus for thin film coating an article Grant 5,620,572 - Bjornard , et al. April 15, 1 | 1997-04-15 |
| Four-layer antireflection coating for deposition in in-like DC sputtering apparatus Grant 5,450,238 - Bjornard , et al. September 12, 1 | 1995-09-12 |
| DC reactively sputtered optical coatings including niobium oxide Grant 5,372,874 - Dickey , et al. December 13, 1 | 1994-12-13 |
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