Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4799881 | """Twist-lock"" gas nozzle for a heat treating furnace" | John K. Grier | 1989-01-24 |
| 4771166 | Electric furnace heater mounting | John K. Grier, Harold Martin Bone, Suresh C. Jhawar, Michael T. Mercer | 1988-09-13 |