| Patents for Harold J. Siekmann |
Patents 16 -
30
of 64
      |
| Number | Date | Patentee | Title | Type |
| 2,232,226 | Feb. 18, 1941 | W.R. Meyer, H.J. Siekmann, W.F. Groene | Crankshaft Lathe | metal lathe chucks |
| 2,232,324 | Feb. 18, 1941 | H.J. Siekmann, W.F. Groene | Orbital Lathe | metalworking machine mechanisms |
| 2,236,057 | Mar. 25, 1941 | W.F. Groene, H.J. Siekmann | Power center drive chuck | metal lathe chucks |
| 2,264,458 | Dec. 02, 1941 | H.J. Siekmann | Vertical Crank Pin Lathe | crank pin lathes |
| 2,267,696 | Dec. 23, 1941 | H.J. Siekmann, W.F. Groene | Blacklash Eliminator for Orbital Lathes | metalworking machine mechanisms |
| 2,269,368 | Jan. 06, 1942 | H.J. Siekmann, W.F. Groene | Hydraulic Feeding Mechanism | metalworking machine mechanisms |
| 2,269,908 | Jan. 13, 1942 | H.J. Siekmann, W.F. Groene | Multiple Spindle Indexing Crankshaft Lathe | crankshaft lathes |
| 2,280,229 | Apr. 21, 1942 | H.J. Siekmann, W.F. Groene | Multiple Spindle Broaching Lathe | crankshaft lathes |
| 2,285,772 | Jun. 09, 1942 | W.F. Groene, H.J. Siekmann | Method of machining crankshafts | crankshaft lathes |
| 2,290,324 | Jul. 21, 1942 | W.F. Groene, H.J. Siekmann | Method of machining crankshafts | crankshaft lathes |
| 2,305,868 | Dec. 22, 1942 | H.J. Siekmann, W.F. Groene | Work Handling Device | metalworking machine mechanisms |
| 2,317,099 | Apr. 20, 1943 | W.F. Groene, H.J. Siekmann | Step threading machine | gunsmith |
| 2,325,849 | Aug. 03, 1943 | W.F. Groene, H.J. Siekmann | Steady rest for lathes | metal lathe accessories and attachments |
| 2,326,638 | Aug. 10, 1943 | W.F. Groene, H.J. Siekmann | Machine tool coolant system | gunsmith |
| 2,330,968 | Oct. 05, 1943 | H.J. Siekmann, W.F. Groene | Multiple Spindle Broaching Lathe Indexing Mechanism | metalworking machine mechanisms |
