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| All Patents in class 29/888.44 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,709,807 | Apr. 16, 1929 | T.S. Purnis | Liner for valve seats | valve and seat maintenance | |
| 1,783,884 | Dec. 02, 1930 | C.C. Lee | Valve-seat liner | valve and seat maintenance | |
| 2,017,154 | Oct. 15, 1935 | E.T. Larkin | Valve Seat Construction for Engines and the Like | valves | |