Thomas Edison had notoriously bad judgment about the viability of his many inventions. He once embarked on an expensive scheme to construct entire houses, including furniture, out of cast concrete. This via IEEE Global History Network:
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Edison’s concrete housing effort began around 1908. Portland cement (which Edison did not invent) was coming into fashion as a construction material. Edison and his team worked on perfecting a formula for mixing concrete (a mixture of cement and filler materials such as sand or gravel) and building re-usable steel molds to cast the walls of houses. By 1910, he had cast two experimental buildings — a gardener’s cottage and a garage — at his New Jersey mansion Glenmont. He announced in the press that he did not intend to profit from the venture, but would instead give away the patented information to qualified builders.
The publicity generated by this announcement attracted the attention of philanthropist Henry Phipps who proposed using the concrete houses to solve New York City’s housing problems.