Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5580002 | Method and apparatus for heating and grinding materials | Arthur G. T. Ward, David J. Ball, Philip Curtis | 1996-12-03 |
| 5011668 | Calcination apparatus | David J. Ball | 1991-04-30 |
| 4915623 | Calcination apparatus | David J. Ball, Philip Curtis, Martin Dzidrums | 1990-04-10 |
| 4533114 | Fail-safe actuator for rotary valves | John M. Cory, Jon A. Babcock, Andrew Pupillo | 1985-08-06 |