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| Patents for H. P. Preis Engraving Machine Co. | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,251,166 | Jul. 29, 1941 | H.P. Preis | Engraving machine pattern and copy character therefor | metal engraving machines | |
| 2,282,473 | May 12, 1942 | J.A. Hoffmann | Copy character holder | metal engraving machines | |
| D155,539 | Oct. 11, 1949 | M.H. Preis, J.A. Hoffman | Design for an engraving machine | metal engraving machines | |
| 2,524,636 | Oct. 03, 1950 | M.H. Preis, J.A. Hofmann | Cutter for pantograph engraving machines | metal engraving machines | |