US Patent: 722,481 - Extension Boring-Bit


	Home\| FAQ	Search:Advanced\|Person\|Company\| Type\|Class	Login


Quick search:	Patent number:	Patent Date:

US Patent: 722,481

Extension Boring-Bit

Patentee:

John C. Beyer (exact or similar names) - Indianapolis, IN

USPTO Classifications:

408/186, 408/194, 408/195, 408/212, 408/213

Tool Categories:

woodworking tools : hand drills : drill bits : adjustable drill bits

Assignees:

None

Manufacturer:

Not known to have been produced

Witnesses:

William H. Payne

E. T. Silvius

Patent Dates:
Applied:	Nov. 13, 1902
Granted:	Mar. 10, 1903

Patent Pictures:

USPTO (New site tip)
Google Patents
Report data errors or omissions to steward Jeff Joslin (dm)

Description:

Primary focus of this patent regards the clamp in the form of a lever, coupled with a toothed locking end and graduations for determining the diameter of the hole.