WD-40 has never been patented as patenting would force them to disclose their recipe.

WD-40

This article is about the lubricant. For the company that manufacturers the product, see WD-40 Company. For the biomolecular structure, see WD40 repeat.

WD-40 spray can from Germany

WD-40 is the trademark name of a penetrating oil and water-displacing spray. The spray is manufactured by the WD-40 Company based in San Diego, California.

History

Different sources credit different men with inventing WD-40 formula in 1953 as part of the Rocket Chemical Company (later renamed to WD-40 Company), in San Diego, California; the formula was kept as a trade secret and was never patented.

According to Iris Engstrand, a historian of San Diego and California history at the University of San Diego, Iver Norman Lawson invented the formu… Continue Reading

Source: https://en.wikipedia.org/wiki/WD-40