Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4428832 | Screening apparatus | Michael Armstrong, Stanley Gilliver | 1984-01-31 |
| 4409096 | Control systems for material treatment plant | — | 1983-10-11 |
| 4308135 | Sizing screens | Michael Armstrong, Stanley Gilliver | 1981-12-29 |
| 4220526 | Sizing screens and feeder devices therefor | Michael Armstrong | 1980-09-02 |