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| All Patents in class 15/104.92 | |||||
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| Number | Date | Patentee | Title | Type | |
| 110,959 | Jan. 17, 1871 | S. Darling | Pen Cleaner | draftsman | |
| 370,379 | Sep. 27, 1887 | S. Darling | Pen Cleaner | draftsman | |
| 370,380 | Sep. 27, 1887 | S. Darling | Pen Cleaner Sponge Cup | draftsman | |