When I was a baby patent agent, I was taught that US patent law had a "moral utility" requirement. That is, the US Patent and Trademark Office would not grant a patent on any invention having no moral utility.
The cited example was Rickard v. Du Bon (103 F. 868, 2d Cir. 1900): A patent on a method of putting spots on tobacco leaves was held invalid, because the only purpose of doing so was to make lower-quality tobacco *appear* to be higher quality, although it did not improve the tobacco in any way.
Since the leaf-spotting method had no utility that wasn't immoral, the patent was invalidated. (cont)
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