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| All Patents in class 335/290 | |||||
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| Number | Date | Patentee | Title | Type | |
| 614,190 | Nov. 15, 1898 | O.S. Walker | Magnetic chuck | magnetic chucks | |
| 1,544,695 | Jul. 07, 1925 | H.K. Spencer | Magnetic Holding Device | magnetic chucks | |
| 1,595,691 | Aug. 10, 1926 | F.L. Simmons | Terminal Block for Magnetic Chucks and the Like | magnetic chuck accessories | |
| 1,604,323 | Oct. 26, 1926 | H.K. Spencer | Magnetic Holding Device | magnetic chucks | |
| 4,402,032 | Aug. 30, 1983 | B.W. Wilterdink | Electromagnet Power Supply and Demagnetizer | magnetic chucks | |