United States Patent no. 7,927,114 was assigned to Hon Hai Precision Ind. Co. Ltd. “Card Edge Connector Having Additional Ground Contact Facilitating Grounding of Inserted Memory Module” was invented by Hua Li and Zhen-Hua Wang. According to the abstract released by the U.S. Patent & Trademark Office, “A card edge connector includes an elongated housing defining a plurality of first and second terminal grooves at opposite sides thereof. A key is located between said first and second terminal grooves. A plurality of first and second terminals are respectively received in said first and second terminal grooves. The outmost of the first terminal together with the outmost of the second terminal are arranged as grounding terminals and form a diagonal configuration to contact with grounding pad defined on the memory module for eliminating EMI.Learn more from USPTO.