Drafting Patent Applications: Writing Method Claims

It is not uncommon for inventors to want to attempt to draft and file patent applications on their own, and I frequently get asked about sample patent applications. Here is where you as an inventor need to make a critical choice, and making a thoughtfully considered business decision is fine.  Notwithstanding, I cringe at times because some will make a reckless choice, or choose because they think you can do as well as a patent attorney who has dedicated their entire career to mastery of the art.  It is true that the cost of hiring an attorney to draft a patent application can price inventors out of the market, so they are left with no real choice, or so it seems. Either you do nothing and simply don’t pursue seeking exclusive rights in the form of a patent, or you have to do something on your own that is within your budget.

If paying a patent attorney is out of the question on a budgetary level you probably would serve yourself well to sit down and carefully go over your budget (which all inventors should do) and ask yourself whether you have the financial resources and abilities to pull off the project. Inventing, patenting and making money by commercializing does not come cheap, and if you have few resources you might be better off building your savings so you can appropriately pursue your inventions in the future. If you are truly an inventor you are creative and, trust me, there will be many inventions in your future.

Inventors who are going to attempt to draft their own patent applications need to go into the process with their eyes wide open, realizing that the resulting patent application will be better if a patent attorney is involved in the drafting, and most importantly understand that numerous things that you can and likely will do that will lead to a resulting patent grant that is compromised, at best, or completely worthless in the worse case scenario. Thus, if you are going to move forward on your own you really must seek the available tools out there to facilitate do-it-yourself efforts. I have created the Invent + Patent System to help create a patent application disclosure, primarily for provisional patent application filings.  Since I created the first edition of the Invent + Patent System tens of thousands of inventors have successfully used it to create high quality provisional patent applications.


From time to time I also try and give tips on drafting patent applications.  I am not trying to encourage people to do it themselves, but experience teaches that there will always be some inventors who will do it themselves out of necessity or otherwise.  For those who are not going to do it themselves the more you know and understand about drafting a patent application, including patent claims, the better armed you will be to provide your patent attorney with the information they need to create the best, most comprehensive patent application possible.  After all, as the inventor you know the invention best so if you have even a basic understanding of the drafting process you will be in a far better position to meaningfully participate even if only by providing the critical information necessary.  The more you provide the better the end product, and with a patent that will act as a barrier to competitors the best end product is the most valuable business (or licensing) asset.

Previously, in Drafting Patent Applications: Writing Patent Claims I focused on claims to an apparatus or device, so today I thought I would focus on method claims. For more articles on drafting patent applications see “Related Posts” at the end of this article.

Method or process claims are relatively easy to write once you know what the core invention is and what is necessary to be included in the claim in order to overcome the prior art.  Like all claims, method or process claims must completely define the invention so that it works for the purpose you have identified AND it must be unique when compared with the prior art.  By unique I mean it must be new (i.e., not identical to the prior art, a 35 USC 102 issue) and it must be non-obvious (i.e., not a trivial or common sense variation of the prior art, a 35 USC 103 issue).


Method or process claims will include active steps to achieve a certain result.  In method claims the transition is typically either “comprising” or “comprising the steps of.”  While legally there may be some distinction between these two different transitions, both are acceptable.

It is also important to understand that each of the steps in a method or process claims use gerunds, which are a form of a verb that ends in “ing” and operates to direct the action that is to take place.  Said another way, you must use “ing” words in method claims.  You cannot define a method or process in the past tense.

When drafting a claim you want to start with something like this:

1. A {insert title} comprising: {list the steps one by one}.

For example:

1. A method for making a cake comprising: placing flour into a bowl; pouring milk into the bowl; cracking an egg into the bowl; mixing the contents of the bowl; pouring the contents into a pan; placing the pan in an oven; cooking for one hour; removing from the oven; removing the cake from the pan; allowing the cake to cool; placing icing on the cake.

First, this claim is not 100% technically correct.  It does have some antecedent basis issues, but that is an article (or more) to explain what that means in any meaningful way for the uninitiated.  Nevertheless, this simple, perhaps silly example, should give you a basic idea about how to write method claims. Notice how the wording is active, with “ing” endings. That is the type of language you should use in a method claim.

Then is subsequent claims you could do something like:

2. The method of claim 1 further comprising preheating the oven.
3. The method of claim 1 wherein the mixing step is accomplished by using an electric mixer.
4. The method of claim 2 wherein the mixing step is accomplished by using an electric mixer.

Notice here that we are adding to the base claim, claim 1. In claim 2 we add another step. To add another step we use the transition “further comprising” and then insert the new step. We can also further define a step already introduced, as in claim 3 and 4, which uses the transition “wherein”. Notice also that claims 3 and 4 are identical, except for the reference back. Claim 3 refers back to claim 1, and claim 4 refers back to claim 2, which in turn refers back to claim 1. By using this type of claim structure you can chain things together, while at the same time have a broad general claim (ie., claim 1). So, in other words, claim 2 and claim 3 each add something. Claim 4 adds both of the elements of claim 2 and claim 3, making claim 4 more specific. You should try and describe your method in this way in the claims.

I really like using the method of making a cake as an example because everyone can understand it on some level.  It also allows for an excellent discussion of steps that are optional and not required.  Of course, for this discussion and illustration we are not concerning ourselves with novelty (35 USC 102) or nonobviousness (35 USC 103), but rather trying to work on the framework of the claim and how one goes about drafting.  I am in no way suggesting this method of making a cake is patentable.

But let’s pretend that this method of baking a cake is patentable and there has never been a method or process like it, so there is no relevant prior art for us to consider (a real fantasy I know).  So what you want to do is focus on the first rule of claim drafting I explained above, make sure the claim delivers on what you say the invention is.  Here we are saying, and I have very carefully referred to it as, “a method of making a cake.”

In your broadest claim you want only what is essential.  So ask yourself this — is greasing the pan an essential step?  Absolutely not!  Of course, if you want to have any realistic opportunity to get the cake out of the pan in one piece you will almost certainly want to grease the pan, but if your method is about making the cake you have successfully done that with the cake securely fastened in the pan that was not greased prior to use.


The greasing of the pan is a perfect example of a desirable step, but not a step that is absolutely required.  You can (and absolutely should) define your invention in any way that works.  One of the biggest mistakes, if not the biggest mistake, inventors make is that they focus only on the versions of the invention that they think work best.  That means they leave open for others the ability to engage making, using and selling slightly less ideal versions of the invention with impunity.  That is a rookie mistake that won’t just embarrass you, but which will likely make any patent you receive tend toward the worthless end of the highly valuable to completely worthless continuum.

What I recommend law students, patent bar exam students and inventors do is practice writing method claims to a method of making a cake.  Create a list of every step you can imagine, from preheating the oven, to what temperature you preheat the oven, to greasing the pan, to how you can tell the cake is done (perhaps with the toothpick test) to you name it.  Then go through your list and identify only those steps that are absolutely required to deliver on the promise of a cake at the end.  Those are the steps you have in your broadest independent claim, with all other steps being fodder for dependent claims.

Now, if you want to start to worry about prior art, what you do is figure out what is in the prior art and then take enough of those optional, dependent claim steps on your list and add them to the independent claim you have.  Add step by step until you have defined a method or process that has at least one unique step.  That should become your broadest independent claim.  Of course, one paragraph on how to deal with prior art isn’t enough, but again should give you some idea.  Look for that in another article in the future.

For information on how to draft patent claims please see:

Additional Information for Inventors

For more tutorial information please see Invention to Patent 101: Everything You Need to Know. For more information specifically on patent application drafting please see:


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