What does “by another who has not abandoned, suppressed, or concealed it” mean in patent law?

This phrase refers to a provision in pre-AIA 35 U.S.C. 102(g) that makes available as prior art the prior invention of another person who has not abandoned, suppressed, or concealed their invention. The MPEP states: “Pre-AIA 35 U.S.C. 102(g) generally makes available as prior art within the meaning of 35 U.S.C. 103, the prior invention…

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