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| Patents for H. H. Doubleday | |||||
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| Picture | Number | Date | Patentee | Title | |
 | 88,535 | Apr. 06, 1869 | A.P. Barlow | Reciprocating mechanism for sawmill | |
 | 107,255 | Sep. 13, 1870 | H.J. Harris | Improvement in Multiple Tool | |
 | 114,085 | Apr. 25, 1871 | S.A. Drake, I. Almy | Improvement in Plane-Irons | |
 | 128,417 | Jun. 25, 1872 | R. Nichol | Improvement in Combined Rules and Dividers | |
 | 198,825 | Jan. 01, 1878 | C.W. Thompson | Improvement in barrel-hoop machines | |
| 205,923 | Jul. 09, 1878 | C.W. Thompson | Improvement in machines for making barrels | ||