MPEP § 608.01(o) — Basis for Claim Terminology in Description (Annotated Rules)

§608.01(o) Basis for Claim Terminology in Description

USPTO MPEP version: BlueIron's Update: 2026-01-17

This page consolidates and annotates all enforceable requirements under MPEP § 608.01(o), including statutory authority, regulatory rules, examiner guidance, and practice notes. It is provided as guidance, with links to the ground truth sources. This is information only, it is not legal advice.

Basis for Claim Terminology in Description

This section addresses Basis for Claim Terminology in Description. Primary authority: 35 U.S.C. 2103, 37 CFR 1.75, and 37 CFR 1.75(d)(1). Contains: 1 requirement, 5 guidance statements, 1 permission, and 1 other statement.

Key Rules

Topic

Claim Status Identifiers

4 rules
StatutoryRecommendedAlways
[mpep-608-01-o-0a692595a001505d57445a81]
Claims Must Support New Terms
Note:
New claims and amendments must be supported by clear description to ensure terms are ascertainable.

New claims, including claims first presented after the application filing date where no claims were submitted on filing, and amendments to the claims already in the application should be scrutinized not only for new matter but also for new terminology. While an applicant is not limited to the nomenclature used in the application as filed, he or she should make appropriate amendment of the specification whenever this nomenclature is departed from by amendment of the claims so as to have clear support or antecedent basis in the specification for the new terms appearing in the claims. This is necessary in order to insure certainty in construing the claims in the light of the specification. See 37 CFR 1.75, MPEP § 608.01(i) and § 1302.01 and § 2103. Note that examiners should ensure that the terms and phrases used in claims presented late in prosecution of the application (including claims amended via an examiner’s amendment) find clear support or antecedent basis in the description so that the meaning of the terms in the claims may be ascertainable by reference to the description, see 37 CFR 1.75(d)(1). If the examiner determines that the claims presented late in prosecution do not comply with 37 CFR 1.75(d)(1), applicant will be required to make appropriate amendment to the description to provide clear support or antecedent basis for the terms appearing in the claims provided no new matter is introduced.

Jump to MPEP Source · 37 CFR 1.75Claim Status IdentifiersNew Matter in ClaimsFiling Date Requirements
StatutoryRecommendedAlways
[mpep-608-01-o-be1001bc7677eac631e3218a]
Claims Must Have Antecedent Basis in Description
Note:
Applicants must ensure new claim terms have clear support in the specification to maintain claim clarity and consistency.

New claims, including claims first presented after the application filing date where no claims were submitted on filing, and amendments to the claims already in the application should be scrutinized not only for new matter but also for new terminology. While an applicant is not limited to the nomenclature used in the application as filed, he or she should make appropriate amendment of the specification whenever this nomenclature is departed from by amendment of the claims so as to have clear support or antecedent basis in the specification for the new terms appearing in the claims. This is necessary in order to insure certainty in construing the claims in the light of the specification. See 37 CFR 1.75, MPEP § 608.01(i) and § 1302.01 and § 2103. Note that examiners should ensure that the terms and phrases used in claims presented late in prosecution of the application (including claims amended via an examiner’s amendment) find clear support or antecedent basis in the description so that the meaning of the terms in the claims may be ascertainable by reference to the description, see 37 CFR 1.75(d)(1). If the examiner determines that the claims presented late in prosecution do not comply with 37 CFR 1.75(d)(1), applicant will be required to make appropriate amendment to the description to provide clear support or antecedent basis for the terms appearing in the claims provided no new matter is introduced.

Jump to MPEP Source · 37 CFR 1.75Claim Status IdentifiersComponents Required for Filing Date
StatutoryRequiredAlways
[mpep-608-01-o-3b3ba41216115ef9e15d7442]
Claims Must Have Clear Support In Description
Note:
Applicant must ensure claims presented late in prosecution have clear support or antecedent basis in the description, without introducing new matter.

New claims, including claims first presented after the application filing date where no claims were submitted on filing, and amendments to the claims already in the application should be scrutinized not only for new matter but also for new terminology. While an applicant is not limited to the nomenclature used in the application as filed, he or she should make appropriate amendment of the specification whenever this nomenclature is departed from by amendment of the claims so as to have clear support or antecedent basis in the specification for the new terms appearing in the claims. This is necessary in order to insure certainty in construing the claims in the light of the specification. See 37 CFR 1.75, MPEP § 608.01(i) and § 1302.01 and § 2103. Note that examiners should ensure that the terms and phrases used in claims presented late in prosecution of the application (including claims amended via an examiner’s amendment) find clear support or antecedent basis in the description so that the meaning of the terms in the claims may be ascertainable by reference to the description, see 37 CFR 1.75(d)(1). If the examiner determines that the claims presented late in prosecution do not comply with 37 CFR 1.75(d)(1), applicant will be required to make appropriate amendment to the description to provide clear support or antecedent basis for the terms appearing in the claims provided no new matter is introduced.

Jump to MPEP Source · 37 CFR 1.75Claim Status IdentifiersNew Matter in Claims
MPEP GuidanceInformativeAlways
[mpep-608-01-o-d8a0ccba81ea9e83c3e9a971]
Claims Must Follow Specification Nomenclature
Note:
The terminology used in claims must align with the nomenclature present in the specification, and new terms should not be introduced without justification.

Usually the terminology of the claims present on the filing date of the application follows the nomenclature of the specification, but sometimes in amending the claims or in adding new claims, new terms are introduced that do not appear in the specification. The use of a confusing variety of terms for the same thing should not be permitted.

Jump to MPEP SourceClaim Status IdentifiersClaim Amendment PracticeComponents Required for Filing Date
Topic

Patent Application Content

2 rules
MPEP GuidanceRecommendedAlways
[mpep-608-01-o-96ee0e18b2dcc95c282c28ef]
Claims Must Be Defined Clearly In Description
Note:
Terms used in claims must be clearly defined and described in the specification, with mechanical terms identified by reference to drawings.

The meaning of every term used in any of the claims should be apparent from the descriptive portion of the specification with clear disclosure as to its import; and in mechanical cases, it should be identified in the descriptive portion of the specification by reference to the drawing, designating the part or parts therein to which the term applies. A term used in the claims may be given a special meaning in the description. See MPEP § 2111.01 and § 2173.05(a).

Jump to MPEP Source · 37 CFR 2173.05(a)Patent Application ContentOptional Claim Content
MPEP GuidanceRecommendedAlways
[mpep-608-01-o-a6087b06fc15746f58115e6d]
Specification Must Provide Support for Claims
Note:
The specification must describe the invention in sufficient detail to support the claims, as required by form paragraph 7.44.

The specification should be objected to if it does not provide proper antecedent basis for the claims by using form paragraph 7.44.

Jump to MPEP SourcePatent Application Content
Topic

Claim Amendment Practice

1 rules
StatutoryRecommendedAlways
[mpep-608-01-o-e4cb16e540e5dcae8ada5d7b]
Claims Must Find Support in Description
Note:
Examiners must ensure that new claim terms and phrases have clear support or antecedent basis in the description to maintain certainty in claim construction.

New claims, including claims first presented after the application filing date where no claims were submitted on filing, and amendments to the claims already in the application should be scrutinized not only for new matter but also for new terminology. While an applicant is not limited to the nomenclature used in the application as filed, he or she should make appropriate amendment of the specification whenever this nomenclature is departed from by amendment of the claims so as to have clear support or antecedent basis in the specification for the new terms appearing in the claims. This is necessary in order to insure certainty in construing the claims in the light of the specification. See 37 CFR 1.75, MPEP § 608.01(i) and § 1302.01 and § 2103. Note that examiners should ensure that the terms and phrases used in claims presented late in prosecution of the application (including claims amended via an examiner’s amendment) find clear support or antecedent basis in the description so that the meaning of the terms in the claims may be ascertainable by reference to the description, see 37 CFR 1.75(d)(1). If the examiner determines that the claims presented late in prosecution do not comply with 37 CFR 1.75(d)(1), applicant will be required to make appropriate amendment to the description to provide clear support or antecedent basis for the terms appearing in the claims provided no new matter is introduced.

Jump to MPEP Source · 37 CFR 1.75Claim Amendment PracticeOptional Claim Content
Topic

Optional Claim Content

1 rules
MPEP GuidancePermittedAlways
[mpep-608-01-o-ec2830546b31cb897998bbd6]
Claims May Have Special Meanings Defined in Description
Note:
A term used in the claims may be given a special meaning that is described in the specification.

The meaning of every term used in any of the claims should be apparent from the descriptive portion of the specification with clear disclosure as to its import; and in mechanical cases, it should be identified in the descriptive portion of the specification by reference to the drawing, designating the part or parts therein to which the term applies. A term used in the claims may be given a special meaning in the description. See MPEP § 2111.01 and § 2173.05(a).

Jump to MPEP Source · 37 CFR 2173.05(a)Optional Claim ContentPatent Application Content
Topic

Claims

1 rules
MPEP GuidanceRecommendedAlways
[mpep-608-01-o-557a8bace31d35c10674bff8]
Claims Must Use Consistent Terminology
Note:
The use of a confusing variety of terms for the same thing in claims should not be permitted.

Usually the terminology of the claims present on the filing date of the application follows the nomenclature of the specification, but sometimes in amending the claims or in adding new claims, new terms are introduced that do not appear in the specification. The use of a confusing variety of terms for the same thing should not be permitted.

Jump to MPEP SourceClaim Status IdentifiersClaim Amendment Practice

Examiner Form Paragraphs

Examiner form paragraphs are standard language that you might see in an Office Action or communication from the USPTO. Examiners have latitude to change the form paragraphs, but you will often see this exact language.

Citations

Primary topicCitation
Claim Amendment Practice
Claim Status Identifiers
35 U.S.C. § 2103
Claim Amendment Practice
Claim Status Identifiers
37 CFR § 1.75
Claim Amendment Practice
Claim Status Identifiers
37 CFR § 1.75(d)(1)
Claim Amendment Practice
Claim Status Identifiers
37 CFR § 1302.01
Optional Claim Content
Patent Application Content
37 CFR § 2173.05(a)
Optional Claim Content
Patent Application Content
MPEP § 2111.01
Claim Amendment Practice
Claim Status Identifiers
MPEP § 608.01(i)
Patent Application ContentForm Paragraph § 7.44

Source Text from USPTO’s MPEP

This is an exact copy of the MPEP from the USPTO. It is here for your reference to see the section in context.

BlueIron Last Updated: 2026-01-17