Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5121109 | Adjustable set point signalling gauge | Frank W. Murphy, Jr., James R. Francisco | 1992-06-09 |
| 4975687 | Hall effect signalling gauge | Frank W. Murphy, Jr., James R. Francisco, Charles R. Lawrence | 1990-12-04 |