Answer
Watt's patent for his steam engine was set to expire in 1800, which posed a significant threat to Boulton and Watt's lucrative business. To safeguard their interests and maintain their monopoly in the market, Boulton actively lobbied Parliament for an extension of Watt's patent. By securing this extension, Boulton aimed to prolong the protection of their revolutionary technology and ensure continued financial success for their company.