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| All Patents in class 222/558 | |||||
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| Number | Date | Patentee | Title | Type | |
| 1,366,334 | Jan. 18, 1921 | F.N. Whitesell | Discharge Gate for Storage Receptacles | conveyors and hoppers | |
| 1,705,885 | Mar. 19, 1929 | F.N. Whitesell | Automatic Feeder | conveyors and hoppers | |
| 2,284,781 | Jun. 02, 1942 | W.H. Ward | Hopper | conveyors and hoppers | |