Ertz; Douglas J.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Ertz; Douglas J..The latest application filed is for "telephony system".
- Ertz; Douglas J. - Boulder CO
| Patent | Date |
|---|---|
| Telephony system Grant 6,535,590 - Tidwell , et al. March 18, 2 | 2003-03-18 |
| Telephony System App 20010043687 - TIDWELL, ROBIN ; et al. | 2001-11-22 |
| Method and system for providing integrated wireline/wireless voice messaging service Grant 6,002,750 - Ertz December 14, 1 | 1999-12-14 |
| Emergency call system with call capacity/last chance routing feature Grant 5,323,444 - Ertz , et al. June 21, 1 | 1994-06-21 |
| Voice and data interface to a voice-mail service system Grant 5,003,577 - Ertz , et al. March 26, 1 | 1991-03-26 |
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