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| All Patents in class 251/300 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,342 | Nov. 10, 1841 | L. Lincoln | Construction of molasses gates and cocks for drawing liquors | ||
| RE105 | Jan. 25, 1848 | L. Lincoln | Improvement in the construction of molasses gates and cocks for drawing liquors | ||
| 1,366,334 | Jan. 18, 1921 | F.N. Whitesell | Discharge Gate for Storage Receptacles | conveyors and hoppers | |