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| Patents for David Ian McDonald | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,913,451 | Oct. 21, 1975 | D.I. McDonald | Hydraulic Cylinder with Cushioning Means | hydraulic apparatus | |
| 3,958,685 | May 25, 1976 | J.G. Wiatt, G.D. Stephenson, G.W. Sederberg, D.I. McDonald | Coupling for Handling Workpiece, Conveyor Combined Therewith, and Method | workpiece changers and storage mechanisms | |