| Patents for Hallis N. Stephan |
Patents 1 -
11
of 11
      |
| Number | Date | Patentee | Title | Type |
| 1,947,862 | Feb. 20, 1934 | H.N. Stephan, H.M. Lucas | Special High Speed Drive for the Spindle of Boring Machine and Other Machine Tools | horizontal boring mills |
| 2,208,311 | Jul. 16, 1940 | H.N. Stephan, H.M. Lucas | Horizontal Boring Machine | horizontal boring mills |
| 2,208,312 | Jul. 16, 1940 | H.N. Stephan, H.M. Lucas | Horizontal Boring Machine | horizontal boring mills |
| 2,255,176 | Sep. 09, 1941 | H.N. Stephan, H.M. Lucas | Horizontal Boring Machine | horizontal boring mills |
| 2,266,647 | Dec. 16, 1941 | H.N. Stephan, H.M. Lucas | Horizontal Boring Machine | horizontal boring mills |
| 2,274,171 | Feb. 24, 1942 | H.N. Stephan | Horizontal Boring and Milling Machine | horizontal boring mills |
| 2,310,878 | Feb. 09, 1943 | H.N. Stephan | Machine Tool | horizontal boring mills |
| 2,339,435 | Jan. 18, 1944 | H.N. Stephan | Machine Tool | horizontal boring mills |
| 2,350,174 | May 30, 1944 | H.N. Stephan, H.M. Lucas | Boring Machine | horizontal boring mills |
| 2,648,999 | Aug. 18, 1953 | H.N. Stephan | Horizontal boring, drilling and milling machine | milling machines |
| 3,023,675 | Mar. 06, 1962 | H.N. Stephan | Horizontal boring, drilling and milling machine | milling machines |
