Boulton boasted about Watt's talents, leading to an employment offer from the Russian government, which Boulton had to persuade Watt to turn down. In 1774 he was able to convince Watt to move to Birmingham, and they entered into a partnership the following year. By 1775 six of the 14 years of Watt's original patent had elapsed, but thanks to Boulton's lobbying Parliament passed an act extending Watt's patent until 1800. Boulton and Watt began work improving the engine. With the assistance of iron master John Wilkinson (brother-in-law of Lunar Society member Joseph Priestley), they succeeded in making the engine commercially viable.