Dyson becomes frustrated with his Hoover vacuum cleaner's declining suction due to clogging bags. Inspired by a cyclone separator used in a sawmill, he spends years developing a bagless vacuum cleaner using cyclonic separation technology. He creates over 5,000 prototypes.

Dyson applies for a patent for his cyclonic vacuum cleaner. He faces significant resistance from established vacuum cleaner manufacturers, who see his invention as a threat to their bag-based business model. His design is widely rejected by major companies like Hoover and Electrolux.

Unable to find a manufacturer in the UK, Dyson licenses his design to a company in Japan. The 'G-Force' vacuum cleaner becomes a status symbol in Japan, generating initial revenue.