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| All Patents in class 217/91 | |||||
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| Number | Date | Patentee | Title | Type | |
| 38,139 | Apr. 14, 1863 | J.L. Alberger | Improvement in metallic hoops | hoop making machines | |
| 119,844 | Oct. 10, 1871 | E.C. Hamlin | Improvement in metallic hoops | ||
| 189,869 | Apr. 24, 1877 | J.D. McEachern, D.H. Burrell | Improvement in wood barrel-hoops | cooper | |
| 207,721 | Sep. 03, 1878 | J.B. Dougherty | Improvement in hoops | hoop making machines | |
| 406,262 | Jul. 02, 1889 | G.T. Chester | Barrel-hoop | cooper | |