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- Q19093873 subject Q6996306.
- Q19093873 subject Q6996516.
- Q19093873 subject Q6998302.
- Q19093873 abstract "Le Roy v. Tatham is an 1852 decision of the United States Supreme Court holding that a principle in the abstract cannot be patented, and no one can claim in it an exclusive right. The inventors had discovered the principle that hot, but congealed, lead under pressure would re-unite as an unbroken solid material, which permitted manufacture of a superior lead pipe. The apparatus to make lead pipe was old and obvious: the inventors, by making slight changes in the old machinery to provide sufficient heat and pressure to remelt the lead, in effect, invented a new use of an old machine. The claim was to the old or obvious apparatus (as an apparatus) "when used to form pipes of metal under heat and pressure in the manner set forth or in any other manner substantially the same." It was not lawful to patent the old apparatus again, however used, so that the patent amounted to an attempt to patent the principle. That made the patent invalid.".
- Q19093873 thumbnail Justice_John_McLean_daguerreotype_by_Mathew_Brady_1849.jpg?width=300.
- Q19093873 wikiPageWikiLink Q11201.
- Q19093873 wikiPageWikiLink Q1371498.
- Q19093873 wikiPageWikiLink Q1717971.
- Q19093873 wikiPageWikiLink Q6996306.
- Q19093873 wikiPageWikiLink Q6996516.
- Q19093873 wikiPageWikiLink Q6998302.
- Q19093873 comment "Le Roy v. Tatham is an 1852 decision of the United States Supreme Court holding that a principle in the abstract cannot be patented, and no one can claim in it an exclusive right. The inventors had discovered the principle that hot, but congealed, lead under pressure would re-unite as an unbroken solid material, which permitted manufacture of a superior lead pipe.".
- Q19093873 label "Le Roy v. Tatham".
- Q19093873 depiction Justice_John_McLean_daguerreotype_by_Mathew_Brady_1849.jpg.