What is the significance of X-Series patents in the MPEP?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-27 10 Rules 5 Related FAQs This page is an FAQ based on guidance from the Manual of Patent Examining Procedure. It is provided as guidance, with links to the ground truth sources. This is information only: it is not legal advice. The MPEP 901.04 provides information about X-Series patents: “X-Series patents were issued from the early 1800’s through the middle 1830’s.” Key points about X-Series patents: They represent some of the earliest patents issued in the United States These patents were issued before the modern numbering system was established They are historically significant but may be less relevant for current patent searches While X-Series patents are not commonly encountered in modern patent practice, understanding their existence is important for comprehensive historical patent research and for tracing the evolution of the U.S. patent system. Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Identification of X-Series Patents Sufficient MPEP 901.04 Patents Were Assigned Sequential Numbers MPEP 901.04 Utility Patents Issued Since 1836 Included Here MPEP 901.04 Design Patents Issued with D Prefix MPEP 901.04 Requirement for Examiner's Action Under 1.104(a)(1) MPEP 901 Effective Date for U.S. Patents MPEP 901.04 Publication Date Is Usually Cited MPEP 901.04 Filing Date as Effective Reference for Patents MPEP 901.04 Pre-AIA 102(e) Patent Can Have Earlier Filing Date MPEP 901.04 Permitted AIA 102(a)(2) Prior Art Date May Be Earlier Filed Application MPEP 901.04 Permitted Other Related FAQs 5 FAQs Collapse How are reissue patents classified in the MPEP? What is the distinction between utility and design patents in the MPEP? Can an abandoned application be used as prior art? What are the exceptions to the 18-month publication rule for patent applications? What is the significance of abandoned applications in patent examination?