Horace W. Hacker (1879–1968) was proprietor of the Hacker Manufacturing Co. in Chicago which made proof presses (featuring reciprocating beds), plate gauges, as well as Potter and Poco proof presses. In 1937 the company was bought by Vandercook & Sons. Hacker was issued 14 printing equipment patents. He later obtained four more unrelated to printing.
| Patent No. | Title | Inventor/Notes | Filing Date | Issue Date |
|---|---|---|---|---|
| 1084085 | Printers Plate-Hook | Hamilton, W. L. | 1/30/1913 | 1/13/1914 |
| 1270410 | Ink Brayer | Hacker, H.W. | 6/8/1917 | 6/25/1918 |
| 1316888 | Plate Gauge | Hacker, H.W. | 6/20/1918 | 9/23/1919 |
| 1385824 | Mounted Printing-Plate | Hacker, H.W. | 12/30/1920 | 7/26/1921 |
| 1453350 | Clamping Mechanism | Hacker, H.W. | 6/13/1921 | 5/1/1923 |
| 1513390 | Planer | Hacker, H.W. | 11/5/1921 | 10/28/1924 |
| 1527299 | Printing Press | Hacker, H.W. | 5/5/1924 | 2/24/1925 |
| 1536093 | Printing Press | Hacker, H.W. | 1/14/1924 | 5/5/1925 |
| 1620343 | Method of and Apparatus For Masking Objects | Hacker, H.W. | 5/9/1923 | 3/8/1927 |
| 1872572 | Method of Producing Printing Plate Blocks | Hacker, H.W. | 4/20/1931 | 8/16/1932 |
| 2033704 | Plate Block | Hacker, H.W. | 1/17/1934 | 3/10/1936 |
| 2033705 | Plate Base | Hacker, H.W. | 12/28/1934 | 3/10/1936 |
| 2125039 | Line-up Gauge | Trotter, H. R. | 10/21/1936 | 7/26/1938 |
| 2241597 | Make-up Gauge | Hacker, H.W. | 7/20/1940 | 5/13/1941 |