Issued Patents 1997
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5680439 | Fixed cellular technical with a distinctive dial tone to indicate an emergency call is being placed | Francisco Javier Leon Rubio, Ramiro Ramirez | 1997-10-21 |
Showing 1–1 of 1 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5680439 | Fixed cellular technical with a distinctive dial tone to indicate an emergency call is being placed | Francisco Javier Leon Rubio, Ramiro Ramirez | 1997-10-21 |