Geometrical instruments – Gauge – Center – point – distance between centers – or centerline location
Reexamination Certificate
2007-05-15
2007-05-15
Fulton, Christopher W. (Department: 2859)
Geometrical instruments
Gauge
Center, point, distance between centers, or centerline location
C033S494000
Reexamination Certificate
active
11050006
ABSTRACT:
A centering ruler includes a first straight edge, a second straight edge, an angle θ therebetween, and a measuring scale, marked on both sides of the ruler, which divides the first straight edge into equal increments. To find the center of a straight side of a workpiece, one aligns a first edge of a first side of a ruler with the straight side, positions a second edge of the ruler at the approximate center of the straight side, measures a minimum distance from a first end of the straight side to the second edge of the ruler, marks a first line of an “X” using the second edge as a guide, flips the ruler over to the second side, aligns the first edge of the ruler with the straight side, measures the afore-determined minimum distance from a second end of the straight side to the second edge of the ruler, and marks a second line of an “X” using the second edge as a guide. The center of the “X” marks the center of the workpiece.
REFERENCES:
patent: 79175 (1868-06-01), Winterbottom
patent: 967561 (1910-08-01), Robbins
patent: 1309930 (1919-07-01), Akin
patent: 1409723 (1922-03-01), Jacob
patent: 1776245 (1930-09-01), Barrett
patent: 2183063 (1939-12-01), Dorsey
patent: 2382250 (1945-08-01), Newell
patent: 3010209 (1961-11-01), McKinley
patent: 3975830 (1976-08-01), Lopacki
patent: 4128030 (1978-12-01), Kundikoff
patent: 4455760 (1984-06-01), Arceneaux, Jr.
patent: 4742619 (1988-05-01), Swanson
patent: 6341427 (2002-01-01), Tepley
Fulton Christopher W.
Rossi Kimms & McDowell LLP
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