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| Patents for Alonzo T. Welch | |||||
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| Picture | Number | Date | Patentee | Title | |
| 306,933 | Oct. 21, 1884 | S. Lawson | Gas Engine | ||
| 307,057 | Oct. 21, 1884 | S. Lawson | Gas Engine | ||
| 399,907 | Mar. 19, 1889 | S. Lawson | Gas Engine | ||
| 399,908 | Mar. 19, 1889 | S. Lawson | Gas Engine | ||
| 402,749 | May 07, 1889 | S. Lawson | Gas Engine | ||
| 402,750 | May 07, 1889 | S. Lawson | Gas Engine | ||
| 402,751 | May 07, 1889 | S. Lawson | Gas Engine | ||
| 433,246 | Jul. 29, 1890 | S. Lawson | Valve for Gas Engines | ||
| 498,476 | May 30, 1893 | S. Lawson | Gas Engine | ||