Understanding Patent Drafting basics

Say you are a patent professional who is newly introduced to the vast world of ‘Patent Drafting’ or a new inventor who is trying to saving cost by doing the heavy-lifting of writing his own patent application. It can be daunting in the beginning but it’s just a matter of getting a hang of it with a bit of practice.

Patent drafting basically refers to preparing a patent application to describe an invention. If an inventor needs to apply for a patent, they need to prepare a patent application and file it with a patent office of the jurisdiction they want to get a patent in. Patent drafting encompasses several technical and legal aspects and requires years of experience and technical/legal know-how to master. Additionally, patent drafting rules and practices vary across jurisdictions and a patent drafter must be well-versed with these practices.

However, there are certain basic check points that a rookie in the patent field can implement to either prepare a high-quality patent application or review a patent application as an inventor to minimize the chances of getting objections on patent applications.

Basic criteria: Uniqueness and industrial applicability

There are usually 3 main criteria that are followed globally for ascertaining the patentability of an invention:

  • Novelty (refers to the invention being distinct from prior art)
  • Inventive Step (refers to the invention being non-obvious over prior-art)
  • Industrial Applicability (the invention should have an application in an industry or a technological domain)

When writing a patent application, a drafter should ensure that they put a great deal of focus on the first two – novelty and inventive step. They need not be explicitly named as is but must be described in the patent application with thorough detail and also brought out in the ‘claims’ section of the patent application. The third point, industrial applicability need not be explicitly described but it should be sufficiently clear that the invention can be employed in an industry or technical field. In fact, a mere mention of the field of the invention is sufficient.

Problem/Solution statement and technical advantages

A drafter must ascertain that they clearly describe the problem the invention solves, in the draft. Patent Offices in jurisdictions such as India and Europe strongly stress on mentioning a technical problem that the invention solves and describing the solution to that problem along with the technical advantages (a.k.a ‘technical effect’ in Europe or ‘technical advancement’ in India) in the patent application. Even in jurisdictions where this is not a necessary requirement, such a description of problem and solution still helps the Patent Office Examiners understand the invention clearly.


I cannot overstress the importance of clarity in patent applications. In fact, most of the patent offices have clarity as a legal requirement for filing patent applications (e.g. refer section 10 of Indian Patent Act, Article 84 of European Patent Convention and 35 U.S.C § 112 of U.S code). Even a minor term whose meaning is unclear can prevent an inventor from getting a patent granted. Therefore, it is important that the entire application should be clearly explained. A drafter should avoid ambiguous usage of words and phrases. I would suggest explaining everything in a simple manner instead of making it complex to understand.

In addition to the description, the drawings should also include clear diagrams/illustrations that are referred to and described in the written description. Also, it is imperative that the ‘claims’ should be clearly and concisely described because they form the focus of examination at the Patent Office. The claimed matter should not only bring out the novelty and inventive step clearly but should also have sufficient detail to encompass the scope the inventor is trying to protect. This leads to my next point – scope of the invention as described below.


As a patent drafter, this is my favourite part while writing a patent application because it allows a patent drafter space to think and create while drafting. But what does scope mean? It basically implies the boundaries of your invention that need to be protected in the patent application. One can also view the scope as the breadth and depth of the invention. Logically, one should target covering maximum scope in a patent application. While covering depth, a drafter should aim for explaining all details from a high-level or broad explanation to the core of the invention. While covering breadth however, one should focus on covering all variations (also called ‘embodiments’ in patent jargon) of the invention. One should try to visualize all possible work-arounds of the invention and capture them in the draft.

On a side note, I have observed several inventors tend to sometimes cover only the prototyped variations. Since there is no such restriction in patent law, my suggestion is to cover all variations and work-arounds regardless of whether they are implemented practically or are mere theoretically ideas.

One caveat that should be taken care of is that all the covered variations should collectively form a single inventive concept (also called as ‘unity of invention’). One should not try to cover several inventive concepts into a single patent application, which often leads to rejection of the patent application.

Cover each section of draft
A patent drafter should avoid writing a patent draft like a long monotonous description without any sections. There should be different sections in a patent application as per legal requirements for various jurisdictions. A drafter should cover all such sections including field of invention, background, summary of invention, brief description of drawings, detailed description, claims and abstract. I will cover sone best practices to write these sections in a separate article.

Jurisdiction-specific requirements

Each jurisdiction has its own set of requirements and a same draft document may not always satisfy requirements for all desired jurisdictions. For example, India specifically requires one to add reference numerals in claims but you need not add them in USA. USA allows 20 free claims but India allows 10 free claims.

There are several such differences across jurisdictions. As an inventor, always check with your patent attorney or agent whether your draft meets such requirements if you’re filing in more than one jurisdictions. You can optimize your patent filings and costs to a great extent on being vigilant about them.

English usage/Typographical errors

Once the above points are taken care of, the drafter should proof-read the entire draft and check for any grammatical errors or inconsistencies. Resolving these errors before filing eliminates any chances of objections related to indefiniteness and can also reduce prosecution costs

Although the above points provide some guidelines for writing great quality patent applications, there are many more intricacies involved in drafting patent applications. Hiring a good patent attorney or a patent agent can be a great investment to this effect.

Disclaimer: The above points are only suggestions and my personal view. They are not recommendations and I am not responsible for the outcome of any patent related matters. Please consult a patent attorney before taking any action based on the above suggestions.