Step 1: Understanding the Concept:
The Patents Act is the primary legislation in India that governs the system of granting patents for inventions. It replaced the earlier Indian Patents and Designs Act, 1911.
Step 2: Detailed Explanation:
The current patent law in India is governed by the Patents Act, 1970. This Act was passed by the Parliament in the year 1970 but came into force on 20th April 1972. The question asks when it "became a law," which refers to the year of its enactment.
The Act was enacted to be compliant with international obligations while also addressing India's specific needs, particularly in sectors like pharmaceuticals and food. It has been significantly amended since, notably in 1999, 2002, and 2005, to align with the WTO's TRIPS agreement.
Step 3: Final Answer:
The Patent Act became a law (was enacted) in the year 1970.