Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6047589 | Apparatus for measuring a gas value | Paul Stephen Hammond, Robert Thurston | 2000-04-11 |
| 4911007 | Flowmeter | David A. Churchill | 1990-03-27 |
| 4756688 | Apparatus and method for the flow control of flue gas to combustion air in a regenerative heating system | Paul Stephen Hammond, David A. Churchill | 1988-07-12 |