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| All Patents in class 285/55 | |||||
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| Number | Date | Patentee | Title | Type | |
| 67,080 | Jul. 23, 1867 | N. Stephens | Improved tap for cement-lined pipes | pipes | |
| 125,345 | Apr. 02, 1872 | M. Stephens | Improvement in branch-couplings for cement pipes | pipes | |
| 142,528 | Sep. 02, 1873 | M. Stephens | Improvement in cement-lined pipes | pipes | |
| 158,539 | Jan. 05, 1875 | M. Stephens | Improvement in cement pipes | pipes | |
| 319,144 | Jun. 02, 1885 | N. Stephens, M.L. Ritchie | Method of utilizing old boiler-tubes | ||
| 1,748,819 | Feb. 25, 1930 | O.U. Zerk | Lubricating Coupler | ||