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| Patents for Portage Double-Quick, Inc. | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,915,949 | Dec. 08, 1959 | R.E. Novkov | End mill driving attachment | milling machine accessories | |
| 2,931,659 | Apr. 05, 1960 | R.E. Novkov | Quick Change Tool Holder | milling machine tools | |
| 2,960,013 | Nov. 15, 1960 | R.E. Novkov | Offsetting attachment for rotating spindle | milling machine accessories | |