MPEP § 909.01 — Assignment, Transfer and Classification Challenges under Cooperative Patent Classification (CPC) (Annotated Rules)

This page consolidates and annotates all enforceable requirements under MPEP § 909.01, 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.

Assignment, Transfer and Classification Challenges under Cooperative Patent Classification (CPC)

This section addresses Assignment, Transfer and Classification Challenges under Cooperative Patent Classification (CPC).

Key Rules

Definitions & Scope (2)

MPEP GuidanceInformativeAlways
[mpep-909-01-dab94477ebe72bb3beda5b73]
C-Star Designations Determine Patent Classification
Note:
The C-Star (C*) designations assigned to a patent application's Cooperative Patent Classification (CPC) symbols determine its classification in the system.

Assignment of a patent application in the Cooperative Patent Classification system is determined by the C-Star (C*) designations assigned to the application. C* is a binary designation given to the family level Cooperative Patent Classification (CPC) symbol(s) on an application that are representative of the claimed subject matter in an application. See MPEP § 905.03.

MPEP GuidanceInformativeAlways
[mpep-909-01-9d970d68e300edfd4bfa39fb]
C-Star Designations Represent Claimed Subject Matter
Note:
C* designations in the Cooperative Patent Classification system must reflect the claimed subject matter of an application as per MPEP § 905.03.

Assignment of a patent application in the Cooperative Patent Classification system is determined by the C-Star (C*) designations assigned to the application. C* is a binary designation given to the family level Cooperative Patent Classification (CPC) symbol(s) on an application that are representative of the claimed subject matter in an application. See MPEP § 905.03.

Citations

Primary topicCitation
MPEP § 905.03

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: 2025-12-31