How do unexplained features in patent drawings affect prior art rejections?

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Source: FAQ (MPEP-Based) BlueIron Update: 2024-09-30 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. Unexplained features in patent drawings can still be used as a basis for prior art rejections. According to MPEP 2125 : “Drawings and pictures can anticipate claims if they clearly show the structure which is claimed. In re Mraz, 455 F.2d 1069, 173 USPQ 25 (CCPA 1972).” This means that: A feature shown in a drawing can be used as prior art even if it’s not explained in the specification. The drawing must clearly show the claimed structure for it to be considered anticipatory. The level of detail in the drawing should be sufficient for a person of ordinary skill in the art to understand the feature. However, it’s important to note that while unexplained features can be used, they should be interpreted in the context of what a person of ordinary skill in the art would reasonably understand from the drawing. If the feature is ambiguous or unclear, it may not be sufficient for a prior art rejection. Related Rules from the Manual of Patent Examining Procedure 10 rules Collapse Drawings Can Anticipate Unexplained Features in Utility Patents MPEP 2125 Drawings Can Anticipate Utility Claims MPEP 2125 Permitted Drawings Must Reasonably Disclose Invention MPEP 2125 Required Drawings Must Show All Claimed Features MPEP 2125 Required Drawing Origin Is Irrelevant MPEP 2125 Drawings Not to Scale Require Caution in Measurement Arguments MPEP 2125 Drawings Not to Scale Require Caution MPEP 2125 Drawings Do Not Define Precise Proportions Without Specification MPEP 2125 Prohibited Drawings Not to Scale Require Description for Size Determination MPEP 2125 Proper Basis for Ornamentality Rejection MPEP 1504.01(c) Other Related FAQs 5 FAQs Collapse How are drawings in design patents treated as prior art? Can draw...