You can without any Patent or copy right sell the product invented by you.
You can sell the product developed by you by any way of business (given below), but you will have to register your selves Under Local(State) Shop and Establishment Act, Other registrations required are 1). Local(State) Shop and Establishment Act,
2). Vat(Sales Tax) and Central Sales Tax,
3). If you are producing anything then , Excise Duty
4). Income Tax
Along with the above registrations, now let us talk about way of business, (Business Structure) it can be any one of the following:
1). Single proprietership i.e. You can as an individual or person do the business(registration not required)
2).Unregistered Partnership
3).Registered Partnership
4). LLP( Limoited liability partnership)
5). Private limited Company
6). Public Limitsd Company