Patent Drawings 101 : Types, Importance & Common Mistakes

Patent Drawings 101 : Patent drawings are the visual form of patent description or invention that provides the best possible way to understand the details of the invention, without reading the complete specifications. There is no law that claims the inclusion of drawings as compulsion, but since it helps to understand well in less time, it is recommended to use. The drawings must include every feature (if not possible, it can even include the all claims made) of the invention as specified in the claims. Patent drawings can be anything such as, illustration of embodiments, chemical equations, stages, flow charts, reference numbers, several views, and photographs of the invention. Patent Drawings 101


Patent Drawings have been classified into the following three categories, on the basis of type of patent application:

  • Utility Patent Drawings: They are the drawings which are used to describe utility-based patents (process-based). These drawings mainly focus on depicting the functioning of all elements (atleast the ones which are claimed) of the invention. These have reference numbers to correlate each other. It can include line drawings showing object shapes, flow charts, electric circuits, block diagrams, chemical formulas, etc.

Further, it can even be depicted through a number of views, such as orthogonal and perspective, isometric, partial, exploded, sectional, alternate, and enlarged views.

  • Design Patent Drawings: They are the drawings that present the ornamental design of a functional item, such as jewellery, computer icons, furniture, etc. These drawings mainly focus on depicting the appearance and aesthetic of the invention. Special focus is given on shades, contour, and material textures of the invention, to enhance its precision. They do not have reference numbers to correlate each other.

Further, it can even be depicted through a number of views, such as standard, exploded, enlarged, isometric, sectional, and movable views.

  • Plant Patent Drawings: These types of drawings are a bit different from utility and design patent drawings. These do not use reference characters to visualize any shape or process, instead, they uses colored or black-and-white drawings. The color drawings include photographs, or images made in permanent water color or oil


Patent drawings are useful due to the following reasons:

  • Inventor’s perspective: Drawings are useful for inventor in two ways, such as use of drawings not only adds more value and clear objective to his/her work, but also it makes it easier for his/her to explain the invention to a concerned person.
  • Subject-matter expert’s perspective: Subject matter experts are specialized in skilled in technical knowledge about the invention. Through the use of drawings, they can enhance the efficiency of inventor’s work. They can help the inventor to present his/her work with more visual influence in front of the examiner, thus enhancing his own reputation in front of the inventor.
  • Patent examiner’s perspective: Drawings makes the invention more precise and easy to understand, depending upon the type of invention. This saves time and efforts of the subject matter expert, which makes invention more likely to get patented.
  • Future inventor’s perspective: Drawings make the new work, more clear to be understood by any future concerned person, who wishes to work on that same topic.

Common Mistakes

Inclusion of drawings within the application enhances the understandability and chances of earning the patent. But at the same, some of the very common mistakes not only ruins the inventor’s hope but also leads the application at the verge of rejection. Some of these are listed below in detail:

  • Lack of diagrams: Some inventions cannot be explained properly without the use of diagrams and absence of proper diagrams can lead to rejection of the patent. Some of those areas include invention of algorithms, processes, and chemical formulas, etc.
  • Unclear diagrams: Some inventions include diagrams, but those diagrams fail to depict its functioning or scope, properly or clearly. This includes use of faded ink for colors, lack of marking at some elements, lack of some features of claims, use of improper reference numbers, and presence of reference numbers but missed some of them, etc.
  • Encounter objections: Drawings are not reviewed by an Office draftsperson; instead they are reviewed by an Office draftsperson only if the examiner seeks the draftsperson’s assistance in identifying errors in the drawings. If he finds that they are unacceptable, the draftsperson provides a ‘Notice of Draftperson’s Patent Drawing Review’ and provides it to the examiner for handing it over back to the inventor to review it once again. Patent Drawings 101
  • Lag in documentation: Sometimes, drawings are submitted (color photographs or drawings) without filing the necessary petition. This depicts that there are no drawings present, relating to the patent application since its record in not filed.
  • Quality issues: Sometimes, drawings are submitted on poor quality paper, that can be easily erased or on translucent paper that can be teared off with due course of time. And even drawings are done with a pencil or other nonblack writing instrument, or on an ink-jet printer, which is totally objectionable. There can be even a case when the drawings are incomplete, presence of overwriting where the elements are marked, use of unacceptable paper sizes, lack of proper margin, lack of hatching in section or cut views, presence of exploded view but not enclosed by a bracket, presence of section or cut view but the section plane not included in general view, use of multiple orientations in a single sheet, use of small drawings to depict complex attributes, use of poor shades that hides the shape or contour details, and when numbering are done in non-Arabic numerals.

All such cases are considered as quality issues, which must be precisely checked before going for patenting.

  • Unresolved issues: Sometimes, the patent examiner asks the inventor to improve the quality, design, etc. (whichever was missing in accordance with the standards), and visit again in a certain given time. And even after pointing out the missing points, the inventor misses rectification of some of those. Due to which the application goes back again for consideration.

There are certain pre-defined standards as well that patent drawings/illustrations have to comply. Inability to follow the standards and lack of full knowledge and skills for patent drawings, can lead to objections being raised during patent examination, thereby resulting in increased patent prosecution time and cost. Thus, all the issues must be clearly checked and verified once before filing, since the patent examiner looks into every minute detail of the claims that are listed in the application by the inventor. And even the absence or incorrect presence of any one of the unleaded claims could lead to rejection. In view of the foregoing discussion, it is important to acknowledge with certain predefined standards.

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