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| All Patents in class 219/69.14 | |||||
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| Number | Date | Patentee | Title | Type | |
| 3,168,638 | Feb. 02, 1965 | M.J. Riddles | Method of Electro-Discharge Machining and Fluids for Use Therin | electrical discharge machining | |
| 3,334,210 | Aug. 01, 1967 | M.J. Riddles, J.L. Williams | Electro-Discharge Machining Fluid and Method | electrical discharge machining | |
| 5,177,335 | Jan. 05, 1993 | R.W. Ritchey, Jr., J.D. Hartwig | Prefilter for EDM machine | electrical discharge machining | |