What are the unpatentable inventions under the Indian Patent Law?

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Sections 3 & 4 of the Patents Act, 1970 enlist the non-patentable inventions. Section 3 reads as follows: The following are not inventions within the meaning of this Act, (a) an invention which is frivolous or which claims anything obviously contrary to well established natural laws; (b) an invention the primary or intended use or… Read more »