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| Patents for Donald J. Cayen | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,988,965 | Nov. 02, 1976 | R.V. Fatke, O.W. Ehrhardt, D.J. Cayen | Two Pressure Counterbalance System for Machine Tool Headstocks | metalworking machine mechanisms | |
| 4,303,360 | Dec. 01, 1981 | J.T. Janeczko, D.J. Cayen | Power Drawfinger System for Machine Tool Spindle | metalworking machine mechanisms | |