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What is Van Der Horst v. Chromium Patent Case about?
The court discusses whether a previous foreign application for the same invention can invalidate a later US patent under the doctrine established in Alexander Milburn Co. v. Davis-Bournonville Co. The court notes that Section 72 of the patent act states that a patent is not invalid if the invention was previously known or used in a foreign country, as long as it was not patented or published there. However, the statute does not clarify whether "known" includes knowledge by foreign patent applicants and offi
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