The idea was initially rejected by the air ministry but undaunted he pressed ahead with developing his invention by forming his own company powerjets Ltd. Throughout the 1930s, the company soldered on despite severe financial difficulties. In 1935, Whittle could not even afford to pay the renewal fee of £5 for his patent. | The idea was initially rejected by the air ministry but undaunted he pressed ahead with developing his invention by forming his own company powerjets Ltd. Throughout the 1930s, the company soldered on despite severe financial difficulties. In 1935, Whittle could not even afford to pay the renewal fee of £5 for his patent. |