How are American patents classified?

There are three types of American patents:

1) The utility model patent can be granted to anyone who invents or discovers any new and useful technology, machine, product or material composition or any new and useful improvement;

2) The design patent can be granted to anyone who invents a new, original and decorative design for the product;

3) A plant patent can be granted to anyone who invents or discovers and reproduces any unique new plant variety asexually.