Which of the following can be patented? 1. Machine 2. Process 3. Composition of matter

Machines, processes and compositions of matter are all classic categories of patentable subject matter. Under section 2(1)(j) of the Patents Act, 1970, an invention is a new product or process involving an inventive step and capable of industrial application, so a machine or a composition (products) and a process all qualify, subject to the exclusions in section 3.