Hartwig; Richard C.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Hartwig; Richard C..The latest application filed is for "battery separator".
- Hartwig; Richard C. - Laurel MD
| Patent | Date |
|---|---|
| Battery separator Grant 5,389,463 - Chang , et al. * February 14, 1 | 1995-02-14 |
| Battery separator Grant 5,389,433 - Chang , et al. February 14, 1 | 1995-02-14 |
| Battery separator Grant 5,362,582 - Chang , et al. * November 8, 1 | 1994-11-08 |
| Battery separator Grant 5,362,581 - Chang , et al. * November 8, 1 | 1994-11-08 |
| Microporous polyurethane based battery separator Grant 5,346,788 - Chang , et al. September 13, 1 | 1994-09-13 |
| Polyurethane coatings for bridge deckings and the like Grant 4,788,269 - Vu , et al. November 29, 1 | 1988-11-29 |
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