Patent 7788994 was granted and assigned to Wright Tool on September, 2010 by the United States Patent and Trademark Office.
A symmetrical open-end wrench having rear side corners adjacent open ends of the throat of the wrench and opposing jaws defining an opening for receiving a fastener, the jaws having parallel planar section, and continuously diverging surfaces with fastener-engaging irregularities merging with the respective rear side corners in a smooth transition.