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Henry Green applied for a patent on his invention of an "electric searing-pen," the purpose of which was to write characters that could not be "erased or obliterated."
Green received this patent, No. 597,373, on January 11, 1898.
“My improved writing implement comprises a handle or stock, a resistance medium, a searing pen or marking in contact with or embedded in the resistance medium, and electric conductors connected, respectively, with said resistance medium and pen, whereby the resistance medium can be brought to a temperature sufficient to heat by radiation the pen or marker, and these several parts may be of any suitable kind or construction.”
United States Patent Office, "Electric Searing Pen," Patent No. 597,373, January 11, 1898.
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