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| Patents for William L. Petersen | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,497,791 | Feb. 14, 1950 | W.L. Petersen | Sanding machine | handheld power sanders | |
| 2,626,412 | Jan. 27, 1953 | W.L. Petersen | Rug scrubbing machine | ||
| 2,640,211 | Jun. 02, 1953 | W.L. Petersen | Rug scrubbing machine | ||
| D170,547 | Oct. 06, 1953 | W.L. Petersen | Sanding machine | sanding machines | |
| 2,666,498 | Jan. 19, 1954 | W.L. Petersen | Suction cleaner | ||
| 2,703,152 | Mar. 01, 1955 | W.L. Petersen | Suction cleaner | ||
| 2,722,700 | Nov. 08, 1955 | W.L. Petersen | Floor treating machine | ||