| Patents for Percy G. Williams |
Patents 1 -
8
of 8
      |
| Number | Date | Patentee | Title | Type |
| 372,441 | Nov. 01, 1887 | W.W. Roovers, P.G. Williams | Coin operated induction coil | |
| 384,010 | Jun. 05, 1888 | W.W. Roovers, P.G. Williams | Cash drawer | |
| RE10,949 | Jul. 24, 1888 | W.W. Roovers, P.G. Williams | Coin Operated Induction Coil | |
| 403,978 | May 28, 1889 | W.W. Roovers, P.G. Williams | Coin released spirometer | |
| 447,857 | Mar. 10, 1891 | P.G. Williams | Galvanic apparatus for the human body | |
| 491,971 | Feb. 14, 1893 | W.W. Roovers, P.G. Williams | Coin controlled dice throwing machine | |
| 572,142 | Dec. 01, 1896 | P.G. Williams | Maze | |
| 590,783 | Sep. 28, 1897 | P.G. Williams | Amusement apparatus | |
