US PATENT SUBCLASS 33 / 30.1
.~.~ Ellipsograph

Current as of: June, 1999
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33 /   HD   GEOMETRICAL INSTRUMENTS

18.1  DF  SCRIBER {10}
27.01  DF  .~ Curved line {13}
30.1.~.~ Ellipsograph {7}
30.2  DF  .~.~.~> Pivoted circular pattern
30.3  DF  .~.~.~> Pattern follower
30.4  DF  .~.~.~> Harmonic component
30.5  DF  .~.~.~> Flexible cord type
30.6  DF  .~.~.~> Sliding leg
30.7  DF  .~.~.~> Planetary scriber arm
31  DF  .~.~.~> Right-angle guides

DEFINITION

Classification: 33/30.1

Ellipsograph:

(under subclass 27.01) Subject matter wherein the curve has a major and a minor axis with two foci on the major axis so

that the sum of the distances from each focus to a point on the curve is equal to the length of the major axis.

SEE OR SEARCH THIS CLASS, SUBCLASS:

27.01+, for nonelliptical curve scribers in which the scribing member is guided around a curved pattern which may or may not be elliptical in form.