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| All Patents in class 451/430 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,753,935 | Apr. 08, 1930 | O.M. Maisch | Cutter | valve reseating tools | |
| 2,135,900 | Nov. 08, 1938 | H.W. Kulp | Grinding Tool | valve grinding tools | |
| 2,136,188 | Nov. 08, 1938 | L. Spraker, G.R. Gagne | Valve Refacing Device | valve grinding tools | |
| 2,308,472 | Jan. 12, 1943 | J.A. Smith, II | Valve seat grinding device | ||
| 2,354,184 | Jul. 25, 1944 | W.W. Daniel | Drive Socket Connector | ||
| 5,337,521 | Aug. 16, 1994 | D. Heyl, D.M. Terpstra | Valve grinder | valve and seat maintenance | |