DUOFONE Logo (USPTO, 04/25/1968)
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The US trademark DUOFONE was filed as Word and figurative mark on 04/25/1968 at the U.S. Patent and Trademark Office.
It was registered as a trademark on 07/15/1969.
The current status of the mark is "EXPIRED".
| Trademark form | Word and figurative mark |
| File reference | 72296597 |
| Register number | 872919 |
| Application date | April 25, 1968 |
| Entry date | July 15, 1969 |
Trademark owner
730 COMMONWEALTH AVE.
02215 BOSTON
US
02215 BOSTON
US
Trademark representatives
goods and services
9
HEADPHONES
ID: 1372296597