Exhibit 10.28 OPTIONAL ADVANCE DEMAND GRID NOTEOptional Advance Demand Grid Note • March 16th, 2006 • MKS Instruments Inc • Industrial instruments for measurement, display, and control
FOR VALUE RECEIVED, MKS INSTRUMENTS, INC., a Massachusetts corporation, with an office at 90 Industrial Way, Wilmington, Massachusetts, and MKS JAPAN, INC., a Japanese corporation, with an office at Harmonize Bldg., 5-17-13, Narita-Higashi, Suginami-Ku, Tokyo, Japan (collectively, the "Borrower"), jointly and severally promise to pay to HSBC BANK USA, NATIONAL ASSOCIATION ("Bank"), or order, on demand, at its 17 South Broadway office in Nyack, New York, United States of America, the aggregate unpaid principal amount of all advances made by the Bank to the Borrower from time to time (each an "Advance" and collectively the "Advances") as evidenced by the inscriptions made on the Schedule attached hereto ("Schedule"), together with interest thereon at a per annum rate as provided herein. The aggregate amount of all advances outstanding hereunder shall not at any time exceed $35,000,000.
