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| Patents for Patrick Clifford | |||||
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| Number | Date | Patentee | Title | Type | |
| 65,726 | Jun. 11, 1867 | P. Clifford | Improvement in combined level and plumb | levels | |
| 71,279 | Nov. 26, 1867 | P. Clifford | Improvement in Adjustable Spirit Levels | inclinometers | |
| 335,110 | Feb. 02, 1886 | J. Coupal, P. Clifford | Micrometer Gage | micrometers | |