While surface shading is not required under 37 CFR 1.152, it may be necessary in particular cases to shade the figures to show clearly the character and contour of all surfaces of any 3-dimensional aspects of the design. Surface shading is also necessary to distinguish between any open and solid areas of the article. However, surface shading should not be used on unclaimed subject matter, shown in broken lines, to avoid confusion as to the scope of the claim.
Lack of appropriate surface shading in the drawing as filed may render the design nonenabling and indefinite under 35 U.S.C. 112(a) and (b), (or for applications filed prior to September 16, 2012, pre-AIA 35 U.S.C. 112, first and second paragraphs). Additionally, if the surface shape is not evident from the disclosure as filed, the addition of surface shading after filing may comprise new matter. Solid black surface shading is not permitted except when used to represent the color black as well as color contrast. Oblique line shading must be used to show transparent, translucent and highly polished or reflective surfaces, such as a mirror. Contrast in materials may be shown by using line shading in one area and stippling in another. By using this technique, the claim will broadly cover contrasting surfaces unlimited by colors. The claim would not be limited to specific material either, as long as the appearance of the material does not patentably depart from the visual appearance illustrated in the drawing.
Stippling（點描）
The two most common uses of broken lines are to disclose the environment related to the claimed design and to define the bounds of the claim. Structure that is not part of the claimed design, but is considered necessary to show the environment in which the design is associated, may be represented in the drawing by broken lines. This includes any portion of an article in which the design is embodied, or applied to, that is not considered part of the claimed design. See In re Zahn, 617 F.2d 261, 204 USPQ 988 (CCPA 1980). Unclaimed subject matter may be shown in broken lines for the purpose of illustrating the environment in which the article embodying the design is used. Unclaimed subject matter must be described as forming no part of the claimed design or of a specified embodiment thereof. A boundary line may be shown in broken lines if it is not intended to form part of the claimed design. Applicant may choose to define the bounds of a claimed design with broken lines when the boundary does not exist in reality in the article embodying the design. It would be understood that the claimed design extends to the boundary but does not include the boundary. When a boundary line is introduced via amendment or in a continuation application, the introduction of the boundary line must comply with the written description requirement of 35 U.S.C. 112(a) (or for applications filed prior to September 16, 2012, pre-AIA 35 U.S.C. 112, first paragraph). See In re Owens, 710 F.3d 1362, 1366-67, 106 USPQ2d 1248, 1251 (Fed. Cir. 2013). For example, unclaimed boundary lines should satisfy the written description requirement where they make explicit a boundary that already exists, but was unclaimed in the original disclosure. See Owens, 710 F.3d at 1368-69, 106 USPQ2d at 1252. Where no boundary line is shown in a design application as originally filed, but it is clear from the design specification that the boundary of the claimed design is a straight broken line connecting the ends of existing full lines defining the claimed design, applicant may amend the drawing(s) to add a straight broken line connecting the ends of existing full lines defining the claimed subject matter where such amendment complies with the written description requirement of 35 U.S.C. 112(a) (or for applications filed prior to September 16, 2012, pre-AIA 35 U.S.C. 112, first paragraph). Additionally, any broken line boundary other than a straight broken line may constitute new matter prohibited by 35 U.S.C. 132 and 37 CFR 1.121(f).
The two most common uses of broken lines are to disclose the environment related to the claimed design and to define the bounds of the claim. Structure that is not part of the claimed design, but is considered necessary to show the environment in which the design is associated, may be represented in the drawing by broken lines. This includes any portion of an article in which the design is embodied, or applied to, that is not considered part of the claimed design. See In re Zahn, 617 F.2d 261, 204 USPQ 988 (CCPA 1980). Unclaimed subject matter may be shown in broken lines for the purpose of illustrating the environment in which the article embodying the design is used. Unclaimed subject matter must be described as forming no part of the claimed design or of a specified embodiment thereof. A boundary line may be shown in broken lines if it is not intended to form part of the claimed design. Applicant may choose to define the bounds of a claimed design with broken lines when the boundary does not exist in reality in the article embodying the design. It would be understood that the claimed design extends to the boundary but does not include the boundary. When a boundary line is introduced via amendment or in a continuation application, the introduction of the boundary line must comply with the written description requirement of 35 U.S.C. 112(a) (or for applications filed prior to September 16, 2012, pre-AIA 35 U.S.C. 112, first paragraph). See In re Owens, 710 F.3d 1362, 1366-67, 106 USPQ2d 1248, 1251 (Fed. Cir. 2013). For example, unclaimed boundary lines should satisfy the written description requirement where they make explicit a boundary that already exists, but was unclaimed in the original disclosure. See Owens, 710 F.3d at 1368-69, 106 USPQ2d at 1252. Where no boundary line is shown in a design application as originally filed, but it is clear from the design specification that the boundary of the claimed design is a straight broken line connecting the ends of existing full lines defining the claimed design, applicant may amend the drawing(s) to add a straight broken line connecting the ends of existing full lines defining the claimed subject matter where such amendment complies with the written description requirement of 35 U.S.C. 112(a) (or for applications filed prior to September 16, 2012, pre-AIA 35 U.S.C. 112, first paragraph). Additionally, any broken line boundary other than a straight broken line may constitute new matter prohibited by 35 U.S.C. 132 and 37 CFR 1.121(f).
However, broken lines are not permitted for the purpose of indicating that a portion of an article is of less importance in the design. See In re Blum, 374 F.2d 904, 153 USPQ 177 (CCPA 1967). broken lines may not be used to show hidden planes and surfaces which cannot be seen through opaque materials. The use of broken lines indicates that the environmental structure or the portion of the article depicted in broken lines forms no part of the design, and is not to indicate the relative importance of parts of a design.
In general, when broken lines are used, they should not intrude upon or cross the showing of the claimed design and should not be of heavier weight than the lines used in depicting the claimed design. When broken lines cross over the full line showing of the claimed design and are defined as showing environment, it is understood that the surface which lies beneath the broken lines is part of the claimed design. When the broken lines crossing over the design are defined as boundaries, it is understood that the area within the broken lines is not part of the claimed design. Therefore, when broken lines are used which cross over the full line showing of the design, it is critical that the description of the broken lines in the specification explicitly identifies their purpose so that the scope of the claim is clear. As it is possible that broken lines with different purposes may be included in a single application, the description must make a visual distinction between the two purposes; such as --The broken lines immediately adjacent the shaded areas represent the bounds of the claimed design while all other broken lines are directed to environment and are for illustrative purposes only; the broken lines form no part of the claimed design.-- Where a broken line showing of environmental structure must necessarily cross or intrude upon the representation of the claimed design and obscures a clear understanding of the design, such an illustration should be included as a separate figure in addition to the other figures which fully disclose the subject matter of the design. Further, surface shading should not be used on unclaimed subject matter shown in broken lines to avoid confusion as to the scope of the claim.
The following form paragraphs may be used, where appropriate, to notify applicant regarding the use of broken lines in the drawings.
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