In 2004, Perdue sued the Environmental Protection Agency to block environmental regulations on reformulated gasoline. Hamilton developed the variational principle, which was reformulated later by Carl Gustav Jacob Jacobi. In fact, in many cases algebraic conceptions were reformulated into geometric terms. Independent product testing noted that manufacturers reformulated their products after bans. It was later reformulated and extensively investigated by Gibbs in 1902. Marvel Cola was reformulated and renamed Jumbo Cola. Original Life has been reformulated several times since its introduction, sometimes unsuccessfully. In response, kombucha suppliers reformulated their products to have lower alcohol levels. Other new or reformulated products would follow. In 1989, Gillette reformulated Liquid Paper such that it did not use trichloroethane. It was Oliver Heaviside who reformulated the complicated Maxwell's equations to the modern form. Ferrara reformulated the Butterfinger in January 2019, with labels displaying "Improved Recipe". It was renamed and reformulated as Cherry 7 Up Antioxidant in January 2009. In 2006, Cookeen was also reformulated to remove trans fats. Hayek reformulated his theory in response to those objections.