| All Patents in class 251/368 |
Patents 1 -
7
of 7
      |
| Number | Date | Patentee | Title | Type |
| 89,344 | Apr. 27, 1869 | A.K. Rider | Pump Valve | pump valves |
| 102,078 | Apr. 19, 1870 | Q.S. Backus | Improved process for facing valves and valve-seats for steam-engines | steam engine valves |
| 556,037 | Mar. 10, 1896 | C.W. Weiss | Valve | internal combustion engine valves |
| 942,699 | Dec. 07, 1909 | L.H. Baekeland | Method of making insoluble products of phenol and formaldehyde | |
| 1,106,860 | Aug. 11, 1914 | A. Bayton | Method or process of forming headed rods | bench vises |
| 2,446,274 | Aug. 03, 1948 | J.N. Gladden | Valve | internal combustion engine valves |
| 2,677,876 | May 11, 1954 | R.E. Juhnke, G. Castera | Method of fabricating a valve member having a body and seat of different metals | |
