Plotting instrument
Description
FIG. 1 is a top plan view of a plotting instrument showing my new design;
FIG. 2 is a top left front perspective view thereof;
FIG. 3 is a bottom right rear perspective view thereof.
Referenced Cited
U.S. Patent Documents
| 3448920 | June 1969 | Hall |
| 3535790 | October 1970 | Gray |
| 3540127 | November 1970 | Kane |
| 3646681 | March 1972 | Koenig |
| 3724079 | April 1973 | Jasperson |
Patent History
Patent number: D254125
Type: Grant
Filed: Jun 28, 1977
Date of Patent: Feb 5, 1980
Inventor: Christopher M. Powell (Ryde, New South Wales 2112)
Primary Examiner: Nelson C. Holtje
Attorney: Leonard J. Robbins
Application Number: 5/811,001
Type: Grant
Filed: Jun 28, 1977
Date of Patent: Feb 5, 1980
Inventor: Christopher M. Powell (Ryde, New South Wales 2112)
Primary Examiner: Nelson C. Holtje
Attorney: Leonard J. Robbins
Application Number: 5/811,001
Classifications
Current U.S. Class:
Geometric (5) (D10/61);
Angle Or Direction (7) (D10/65)
International Classification: D1004;
International Classification: D1004;
