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| Patents for Jim Dvorak | |||||
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| Picture | Number | Date | Patentee | Title | |
| 3,899,950 | Aug. 19, 1975 | J. Dvorak | Bar shear | ||
| 3,945,287 | Mar. 23, 1976 | J. Dvorak | Sheet shear | ||
| 4,054,075 | Oct. 18, 1977 | J. Dvorak | Shear mechanism | ||
| CA-1,058,512 | Jul. 17, 1979 | J. Dvorak | Shear mechanism | ||
 | 4,907,481 | Mar. 13, 1990 | J. Dvorak, C.J. Dvorak | Powered press with manual punch and die alignment capability | |
 | 5,170,689 | Dec. 15, 1992 | J. Dvorak | Metal working machine | |