What is a patent
Patent, under the Act, is a grant from the Government to the inventor for a limited period of time, the exclusive right to make use, exercise and vend his invention. After the expiry of the duration of patent, anybody can make use of the invention.
What is an invention
Invention means any new and useful
art, process, method or manner of manufacture
machine, apparatus or other article
substance produced by manufacture
and includes any new and useful improvement of any of them, and alleged invention
Therefore an invention is the creation of intellect applied to capital and labour, to produce something new and useful. Such creation becomes the exclusive property of the inventor on grant of patent.