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| All Patents in class 285/401 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,307,734 | Jun. 24, 1919 | A.V. Gullborg | Lubricating Means | oil cups | |
| 1,679,825 | Aug. 07, 1928 | R.J. Holmgreen, J.H. Holmgreen | Rotary Well Drilling Machine | well drilling machines | |
| 2,066,956 | Jan. 05, 1937 | G.H. Williams | Automatic Coupling | oil well pumps | |