What Are the Different Types of Patents?

There are three types of patents that an inventor can obtain in the United States: a utility patent, a design patent and a plant patent. The type of patent with which most people are familiar is a utility patent, which is a patent for a new and useful invention. The subject matter for each of the three types of patents is discussed further below.

Utility Patents

In order to obtain a utility patent, the invention must be for a “new and useful process, machine, manufacture, or composition of matter . . . .” This requirement is fairly straightforward and is usually not a problem, except in certain areas.

A series of very vague, indefinite and often misleading maxims have arisen over time to address what may and may not be patented. For example, “mathematical algorithms,” “mental steps,” “laws of nature,” “products of nature,” “methods of doing business,” and “printed matter” have, in the past, been held to be not patentable. Patents are regularly issued that defy these maxims. For instance, purified products of nature are generally patentable, assuming that the other requirements of patentability are satisfied. In addition, computers and the Internet have now transformed methods of doing business and mathematical algorithms into protectable machines and processes.

Decisions by the Federal Circuit Court of Appeals favorable to patent applicants have caused the U.S. Patent and Trademark Office to rewrite and loosen its guidelines for examining patent applications for software inventions.

Medical procedures are patentable in the United States; however, the patentee’s ability to sue all infringers of a patent directed to a medical procedure has been curtailed by recent legislation. This legislation makes it even more important to consider likely defendants when drafting a patent claim. For instance, it is usually easier to sue the manufacturer of an infringing product than the consumers, so the patent should be drafted to cover the product as it leaves the factory—as opposed to how it may be used by the consumer—so as to avoid having to show the additional elements of contributory infringement. Many foreign countries limit the patentability of medical procedures.

Design Patents

Design patents have different subject matter requirements from utility patents, as set forth in 35 U.S.C. sec. 171, which reads as follows: “Whoever invents any new, original and ornamental design for an article of manufacture may obtain a patent therefor, subject to the conditions and requirements of this title. The provisions of this title relating to patents for inventions shall apply to patents for designs, except as otherwise provided.”

One difference between utility patents and design patents is the length of their terms. Utility patents generally have a term of twenty years from the earliest effective filing date—or seventeen years from issuance, depending on when they were filed. Design patents have a term of fourteen years from issuance. (More)