Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4987914 | Mass flowmeter apparatus | Charles W. Alworth, John B. Durkee, Bryce T. Jeffries | 1991-01-29 |
| 4962666 | Mass flowmeter apparatus | Charles W. Alworth, John B. Durkee, Bryce T. Jeffries | 1990-10-16 |
| 4718443 | Mass flowmeter apparatus | Charles W. Alworth, John B. Durkee, Bryce T. Jeffries | 1988-01-12 |