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| Patents for Fred S. Haas | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,665,160 | Apr. 03, 1928 | F.S. Haas, W. Peaslee, S. Einstein | Automatic Size-Grinding Machine | grinding machines | |
| 1,723,852 | Aug. 06, 1929 | F.S. Haas | Grinding Machinery | grinding machines | |
| 1,776,241 | Sep. 16, 1930 | F.S. Haas, J.E. Caster | Grinding Machinery | grinding machines | |
| 1,840,231 | Jan. 05, 1932 | F.S. Haas, R.E. Harrison | Grinding Machine | grinding machines | |