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US Patent: 79,767
Ornamenting Metals
Improvement in Screw Cutting Lathes
Patentee:
J. P. Theodore Lang - Washington, DC

USPTO Classifications:
82/136

Tool Categories:
metalworking machines : metal lathes : screwcutting lathes

Assignees:
J. P. Theodore Lang - Washington, DC
E. H. Ashcroft - Boston, MA
S. S. Fahnestock - Washington, DC

Manufacturer:
Not known to have been produced

Witnesses:
S. S. Fahnestock
Joseph I. Peyton

Patent Dates:
Granted: Jul. 07, 1868

Patent Pictures:
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Description:
The nature of my invention consists in so constructing a lathe for chasing screws as to secure the machinery against unnecessary wear, as well as accident, and secure the operating machinist against any mistakes in chasing over the same thread, and at the same operation, saving a great deal of time.

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