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| Patents for Enos S. Costa | |||||
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| Number | Date | Patentee | Title | Type | |
| 768,113 | Aug. 23, 1904 | E.S. Costa | Self Tightening Tool Holder | tool holders | |
| 843,931 | Feb. 12, 1907 | E.S. Costa | Self Tightening Tool Holder and Tool | stoneworking | |
| 878,776 | Feb. 11, 1908 | E.S. Costa | Self Tightening Bushing Tool Holder and Tools | stoneworking | |