| US 7,428,782 B1 | ||
| Plotting board with magnetic pivot | ||
| Robert F. Beck, Jr., Franklin, N.J. (US); Amit J. Makhijani, Lakewood, N.J. (US); Jason P. Monico, Hoboken, N.J. (US); and Ralph C. Tillinghast, Hardwick, N.J. (US) | ||
| Assigned to The United States of America as represented by the Secretary of the Army, Washington, D.C. (US) | ||
| Filed on Jul. 13, 2006, as Appl. No. 11/457,154. | ||
| Claims priority of provisional application 60/595569, filed on Jul. 15, 2005. | ||
| Int. Cl. B43L 9/16 (2006.01); G01C 21/22 (2006.01) | ||
| U.S. Cl. 33—435 [33/1 SD; 33/DIG. 1] | 8 Claims |
| 1. A plotting board, comprising:
a base plate;
a substantially transparent, circular top plate;
a pivot that holds the top plate tightly to the base plate, the top plate and the base plate being rotatable and detachable
with respect to each other, the pivot including a magnet wherein at least a portion of the pivot is disposed at a substantially
central point on the top plate;
the pivot including male and female mating portions with the male portion disposed on one of the base plate and the top plate
and the female portion disposed on the other of the base plate and the top plate.
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