Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6290650 | Tonometry system for monitoring blood pressure | Robert D. Butterfield, Charles R. Holdaway, Stephen A. Martin | 2001-09-18 |
| 5908027 | Tonometry system for monitoring blood pressure | Robert D. Butterfield, Charles R. Holdaway, Stephen A. Martin | 1999-06-01 |
| 5284150 | Tonometry system for determining blood pressure | Robert D. Butterfield, Charles R. Holdaway, Stephen A. Martin | 1994-02-08 |
| 5240007 | Apparatus and method for moving a tissue stress sensor for applanating an artery | Stephen A. Martin, Robert D. Butterfield, William Ewing | 1993-08-31 |
| 5195522 | Tonometry sensor calibration apparatus | Stephen A. Martin, Robert D. Butterfield | 1993-03-23 |
| 5158091 | Tonometry system for determining blood pressure | Robert D. Butterfield, Charles R. Holdaway, Stephen A. Martin | 1992-10-27 |