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| Patents for Nelson Spofford | |||||
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| Number | Date | Patentee | Title | Type | |
| 25,984 | Nov. 01, 1859 | N. Spofford | Bit-stock with clam-style chuck | brace chucks | |
| RE2,576 | Apr. 23, 1867 | N. Spofford | Improvement in braces for bits | brace chucks | |
| 79,272 | Jun. 23, 1868 | C. Corliss, N. Spofford | Improvement in Instruments for Adding and Registering Numbers | ||
| RE8,215 | May 07, 1878 | N. Spofford | Improvement in braces for bits | brace chucks | |
| 225,768 | Mar. 23, 1880 | N. Spofford | Bit-brace | brace chucks | |
| 234,624 | Nov. 16, 1880 | N. Spofford | Bit-brace | braces | |