US Patent: 612,412
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| Index-head for milling-machines
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Patentee:
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| Carl L. Grohmann (exact or similar names) - Hartford, CT |
| Manufacturer: |
| Not known to have been produced |
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Patent Dates:
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| Applied: |
Nov. 05, 1897 |
| Granted: |
Oct. 18, 1898 |
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Jeff Joslin
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Description: |
| We could not determine what the inventor, Carl Ludwig Grohmann, was doing in 1897-98 when he applied for and was granted this patent, 608,854, 610,677, 612,239 612,240, 612,332, and 612,466. The first of those patents was assigned to Pratt & Whitney but none of the others were so assigned. In 1900 he was chief draftsman for the Dow Composing Machine Company. A 1903 clutch patent 736,517, was assigned to that firm, which seems to have been in financial difficulty before that patent was issued. Grohmann's 1905 Linotype-machine patent, 786,211, was assigned to the Mergenthaler Linotype Co. The December 1908 Electric Journal had a note, "Mr. Carl L. Grohmann, until recently chief engineer with the National Cash Register Company, has become associated with the engineering staff of the Niles-Bement-Pond Company, at Hartford, Connecticut." By 1912 Grohmann was the head of Pratt & Whitney's drafting department. |
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