[Answer] Which of these well-known products is NOT patented?

Step 1 : Introduction to the question "Which of these well-known products is NOT patented?"

...WD-40 is the trademark name of a penetrating oil and water-displacing spray. Norm Larsen, the founder of WD-40 aimed to develop a line of rust-prevention solvents for use in the aerospace industry. He succeeded at the goal on the 40th attempt, hence the name. It was first used to protect the outer skin of the Atlas Missile from rust and corrosion. It was later found to have many household uses and was made available to consumers in 1958. The company never patented WD-40, in order to avoid having to disclose the ingredients publicly.

Step 2 : Answer to the question "Which of these well-known products is NOT patented?"

WD-40:

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