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| All Patents in class 220/663 | |||||
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| Number | Date | Patentee | Title | Type | |
| 143,574 | Oct. 14, 1873 | J.C. Hoadley | Dead-Lights for Steam-Boilers | low water alarms | |
| 498,299 | May 30, 1893 | W.L. Mullins, T.W. Petway | Coffee Roaster | coffee roasters | |
| 1,129,988 | Mar. 02, 1915 | E.A. Kelsey | Sight Glass | lubricating accessories | |
| 1,164,694 | Dec. 21, 1915 | R. Wood | Sight Glass | steam engine lubricators | |
| 2,604,229 | Jul. 22, 1952 | E. Schwarz | Closure Seal for Vacuum Vessels | manufacturing processes | |