MPEP 2104
Requirements of

Ninth Edition of the MPEP, Revision 07.2022, Last Revised in February 2023

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2104    Requirements of 35 U.S.C. 101 [R-07.2022]

Patents are not granted for all new and useful inventions and discoveries. For example, the subject matter of the invention or discovery must come within the boundaries set forth by 35 U.S.C. 101, which permits a patent to be granted only for "any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof."

35 U.S.C. 101 Inventions patentable.

Whoever invents or discovers any new and useful process, machine, manufacture, or composition of matter, or any new and useful improvement thereof, may obtain a patent therefor, subject to the conditions and requirements of this title.

35 U.S.C. 101 has been interpreted as imposing four requirements, which are described below.


35 U.S.C. 101 requires that whoever invents or discovers an eligible invention may obtain only ONE patent therefor. Thus, it prevents two patents issuing on the same invention to the same inventor (i.e., the same inventive entity) or where there is a common (joint) inventor or common applicant/assignee. The "same invention" means that identical subject matter is being claimed. This requirement forms the basis for statutory double patenting rejections. If more than one patent is sought, a patent applicant will receive a statutory double patenting rejection for claims included in more than one application that are directed to the same invention.

See MPEP § 804 for a full discussion of the prohibition against double patenting. Use form paragraphs 8.30, 8.31 and 8.32 for statutory double patenting rejections.


The inventor(s) must be the applicant in an application filed before September 16, 2012, (except as otherwise provided in pre-AIA 37 CFR 1.41(b) ) and the inventor or each joint inventor must be identified in an application filed on or after September 16, 2012. See MPEP § 2109 for a detailed discussion of inventorship and MPEP § 602.01(c) et seq. for details regarding correction of inventorship.

In the rare situation where it is clear the application does not name the correct inventorship and the applicant has not filed a request to correct inventorship under 37 CFR 1.48, the examiner should reject the claims under 35 U.S.C. 101 and 115 for applications subject to AIA 35 U.S.C. 102 (see MPEP § 2157) or under pre-AIA 35 U.S.C. 102(f) for applications subject to pre-AIA 35 U.S.C. 102 (see MPEP § 2137).


A claimed invention must be eligible for patenting. As explained in MPEP § 2106, there are two criteria for determining subject matter eligibility: (a) first, a claimed invention must fall within one of the four statutory categories of invention set forth in 35 U.S.C. 101, i.e., process, machine, manufacture, or composition of matter; and (b) second, a claimed invention must be directed to patent-eligible subject matter and not a judicial exception (unless the claim as a whole includes additional limitations amounting to significantly more than the exception). The judicial exceptions are subject matter which courts have found to be outside of, or exceptions to, the four statutory categories of invention, and are limited to abstract ideas, laws of nature and natural phenomena (including products of nature). Alice Corp. Pty. Ltd. v. CLS Bank Int'l, 573 U.S. 208, 216, 110 USPQ2d 1976, 1980 (2014) (citing Association for Molecular Pathology v. Myriad Genetics, Inc., 569 U.S. 66, 70, 106 USPQ2d 1972, 1979 (2013)). See also Bilski v. Kappos, 561 U.S. 593, 601, 95 USPQ2d 1001, 1005-06 (2010) (citing Diamond v. Chakrabarty, 447 U.S. 303, 309, 206 USPQ 193, 197 (1980)).

See MPEP § 2106 for a discussion of subject matter eligibility in general, and the analytical framework that is to be used during examination for evaluating whether a claim is drawn to patent-eligible subject matter, MPEP § 2106.03 for a discussion of the statutory categories of invention, MPEP § 2106.04 for a discussion of the judicial exceptions, and MPEP § 2106.05 for a discussion of how to evaluate claims directed to a judicial exception for eligibility. See MPEP § 2106.07(a)(1) for form paragraphs for use in rejections under 35 U.S.C. 101 based on a lack of subject matter eligibility. See also MPEP § 2105 for more information about claiming living subject matter, as well as the Leahy-Smith America Invents Act (AIA)'s prohibition against claiming human organisms.

Eligible subject matter is further limited by the Atomic Energy Act explained in MPEP § 2104.01, which prohibits patents granted on any invention or discovery that is useful solely in the utilization of special nuclear material or atomic energy in an atomic weapon.


A claimed invention must be useful or have a utility that is specific, substantial and credible.

A rejection on the ground of lack of utility is appropriate when (1) it is not apparent why the invention is "useful" because applicant has failed to identify any specific and substantial utility and there is no well established utility, or (2) an assertion of specific and substantial utility for the invention is not credible. Such a rejection can include the more specific grounds of inoperativeness, such as inventions involving perpetual motion. A rejection under 35 U.S.C. 101 for lack of utility should not be based on grounds that the invention is frivolous, fraudulent or against public policy. See Juicy Whip Inc. v. Orange Bang Inc., 185 F.3d 1364, 1367-68, 51 USPQ2d 1700, 1702-03 (Fed. Cir. 1999) ("[Y]ears ago courts invalidated patents on gambling devices on the ground that they were immoral…, but that is no longer the law…Congress never intended that the patent laws should displace the police powers of the States, meaning by that term those powers by which the health, good order, peace and general welfare of the community are promoted…we find no basis in section 101 to hold that inventions can be ruled unpatentable for lack of utility simply because they have the capacity to fool some members of the public.").

The statutory basis for this rejection is 35 U.S.C. 101. See MPEP § 2107 for guidelines governing rejections for lack of utility. See MPEP §§ 2107.01 - 2107.03 for legal precedent governing the utility requirement. See MPEP § 2107.02, subsection IV, for form paragraphs to be used to reject claims under 35 U.S.C. 101 for failure to satisfy the utility requirement.