展览3.1特拉华州州务卿办公室 -------------------------------- 我哈里特·史密斯温莎,特拉华州的国务卿,特此证明的附件是一个真实的和正确的副本证书修正案“KLA-TENCOR公司”,在这个办公室1月的第十二天,公元2001年,上午9点[SEAL] /s/哈里特·史密斯·温莎-----------------------------------------哈里特·史密斯·温莎，国务卿0814199 8100认证:0932528 010037785日期:特拉华州公司秘书部门于2001年12月1日上午09:00提交的文件010022228 - 0814199根据特拉华州《一般公司法》组织和存在的公司特此证明:上述公司的董事会，在一个适当召集和举行的会议上，通过了一项决议，提出并宣布对上述公司的公司证书进行以下修改是明智的:决议，经修订和重述的公司注册证书应通过改变其编号为“第四”的条款予以修订，因此，经修订的公司注册证书的条款应如下:公司有权发行的股票总数为5.01亿股，每股的票面价值为0.001美元。这些股份应分为以下类别:(1)5亿股应指定为普通股;(2) 1,000,000股应指定为优先股。董事会授权,任何法律规定的限制,为股票的发行优先股的系列,并申请一个证书按照特拉华州的适用法律,建立不时股票的数量被包括在每一个这样的系列, and to fix the designation, powers, preferences, and rights of the shares of each such series and any qualifications, limitations or restrictions thereof. The number of authorized shares of Preferred Stock may be increased or decreased (but not below the number of shares thereof then outstanding) by the affirmative vote of the holders of a majority of the then outstanding shares of Common Stock, without a vote of the holders of the Preferred Stock, or of any series thereof, unless a vote of any such holders is required pursuant to the certificate or certificates establishing the series of Preferred Stock." 2. That thereafter, pursuant to resolution of its Board of Directors, a special meeting of the stockholders of said corporation was duly called and held, upon notice in accordance with Section 222 of the General Corporation Law of the State of Delaware at which meeting the necessary number of shares as required by statute were voted in favor of the amendment. 3. That the aforesaid amendment was duly adopted in accordance with the applicable provisions of Sections 242 and 222 of the General Corporation Law of the State of Delaware. 4. That the capital of said corporation will not be reduced under or by reason of said amendment. IN WITNESS WHEREOF, said KLA-Tencor Corporation has caused this certificate to be signed by JOHN H. KISPERT, its Chief Financial Officer, and STUART J. NICHOLS, its Assistant Secretary, this 10 day of January 2001. /s/ JOHN H. KISPERT ----------------------------- JOHN H. KISPERT Chief Financial Officer /s/ STUART J. NICHOLS ----------------------------- STUART J. NICHOLS Assistant Secretary