Patent Drawing Symbols for Draftsmen

Copyright: USPTO – Patent Drawing Symbols

Graphical symbols for conventional elements may be used on the drawing when appropriate, subject to approval by the Office.

NOTES: In general, in lieu of a symbol, a conventional element, combination, or circuit may be shown by an appropriately labeled rectangle, square, or circle; abbreviations should not be used unless their meaning is evident and not confusing with the abbreviations used in the suggested symbols.