Note 6 - Commitments and Contingencies Minimum lease commitments At September 30, 2017, Veecos total future minimum lease payments under non-cancelable operating leases (exclusive of renewal options) are payable as follows: Operating Leases (in thousands) Payments due by period: 2017 $ 1,678 2018 5,474 2019 5,002 2020 4,763 2021 1,807 Thereafter 4,505 Total $ 23,229 Purchase commitments Veeco has purchase commitments of $151.7 million at September 30, 2017, substantially all of which become due within one year. Bank guarantees Veeco has bank guarantees and letters of credit issued by a financial institution on its behalf as needed. At September 30, 2017, outstanding bank guarantees and letters of credit totaled $3.7 million, and unused bank guarantees and letters of credit of $67.9 million were available to be drawn upon. Legal proceedings On September 21, 2017, Blueblade Capital Opportunities LLC et al., on behalf of purported beneficial owners of 440,100 shares of Ultratech common stock, filed an action against Ultratech in Delaware Court of Chancery requesting an appraisal of the value of their Ultratech stock pursuant to 8 Del. C. 262. The Company believes that the merger price, which was the product of arms-length negotiations, was fair and reasonable, and intends to contest the appraisal claim. Discovery in the matter has commenced. On April 12, 2017, the Company filed a patent infringement complaint in the U.S. District Court for the Eastern District of New York against SGL Carbon, LLC and SGL Carbon SE (collectively, SGL), alleging infringement of patents relating to wafer carrier technology used in MOCVD equipment. The complaint alleges that SGL infringes Veecos patents by making and selling certain wafer carriers to Veecos competitor, Advanced Micro-Fabrication Equipment, Inc. (AMEC). On November 2, 2017, the U.S. District Court granted the Companys motion for a preliminary injunction prohibiting SGL from shipping wafer carriers using the Companys patented technology without the Copmanys expr