Digital Telecommunications Systems, Inc.
Patent Applications and Registrations
Patent applications and USPTO patent grants for Digital Telecommunications Systems, Inc..The latest application filed is for "ring-back powered telephone with nonvolatile memory structure".
- Digital Telecommunications Systems, Inc. - Dallas TX
- Digital Telecommunications Systems, Inc. - Richardson TX
| Patent | Date |
|---|---|
| Ring-back powered telephone with nonvolatile memory structure Grant 5,161,184 - Smith , et al. November 3, 1 | 1992-11-03 |
| Personalized telephone for automatic access to operator services Grant 4,947,422 - Smith , et al. August 7, 1 | 1990-08-07 |
| Line power control circuit for pay station telephone Grant 4,942,604 - Smith , et al. July 17, 1 | 1990-07-17 |
| Pay station telephone call routing apparatus Grant 4,926,469 - Smith , et al. May 15, 1 | 1990-05-15 |
| Pay station telephone interface circuits Grant 4,924,497 - Smith , et al. May 8, 1 | 1990-05-08 |
| Pay station telephone call answer supervision apparatus Grant 4,916,733 - Smith , et al. April 10, 1 | 1990-04-10 |
| Pay station telephone interface Grant 4,777,647 - Smith , et al. October 11, 1 | 1988-10-11 |
uspto.report is an independent third-party trademark research tool that is not affiliated, endorsed, or sponsored by the United States Patent and Trademark Office (USPTO) or any other governmental organization. The information provided by uspto.report is based on publicly available data at the time of writing and is intended for informational purposes only.
While we strive to provide accurate and up-to-date information, we do not guarantee the accuracy, completeness, reliability, or suitability of the information displayed on this site. The use of this site is at your own risk. Any reliance you place on such information is therefore strictly at your own risk.
All official trademark data, including owner information, should be verified by visiting the official USPTO website at www.uspto.gov. This site is not intended to replace professional legal advice and should not be used as a substitute for consulting with a legal professional who is knowledgeable about trademark law.
| 