When a patent is issued for an object, it gives its holder the exclusive right to produce, sell, and use the object of the patent for years from the date of application

20

Explanation:

Patents are exclusive rights given to an inventor for his/her unique inventions that is not available otherwise. Patent could be on a product or a process. The idea is protected by means of patent as it cannot be copied by any other individual or organization till the period of patent expires.

Patent is generally granted for 20 years in the United States from the date of registration with some exceptions as the case may be. It is granted by a government organization called US patent and trademark office. It is given to promote innovations and inventions.

d. low interest rates

a

explanation:

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