How to Challenge Patents: Affordable Ways to Respond to Infringement Claims

What are affordable ways to challenge patents?

As a patent attorney, it is my job not only to protect innovation, but also to facilitate fair competition. Innovative products can make life more enjoyable or, in some cases, more tolerable. Competition can make life more affordable. Competition, however, must be fair. And fair competition respects the valid IP rights of innovators and sometimes involves a challenge to patents.

If you are on the receiving end of a cease-and-desist letter or some assertion of infringement, it helps to know your options when you feel that a particular patent should not apply to your products.

Need a cost-effective way to challenge patents? Contact US patent attorney Vic Lin at vlin@icaplaw.com to explore working with us.

What makes a patent reply letter effective?

One fairly inexpensive approach is a reply letter with detailed reasons why you believe the patent is invalid or not infringed. Keep in mind that noninfringement is different than invalidity, so it would be best to use an experienced US patent attorney to formulate the precise technical arguments.

It’s a strategic decision on whether or not to include claim charts in your letter. At a minimum, your letter should contain a sufficiently detailed analysis that would give the patent owner pause. Pithy conclusory statements of “we don’t infringe” or “your patent is invalid” will likely accomplish little. Instead, a thorough explanation of the reasons why their patent should not prevent you from competing will likely make the patent owner (and their patent attorney) think twice before enforcing their patent any further.

Imagine if you were the patent owner that sent out a cease-and-desist letter. What would make a bigger impact, a curt reply without any explanations or an articulate response with intelligent arguments? How would a reasonable patent owner respond to these different types of replies? You have to assume the patent owner will act reasonably; otherwise, all bets are off since it won’t make much difference what you do when the other side is unreasonable.

What do you need in order to challenge patents?

Good prior art is the key to challenging the validity of a patent. Ideally, you want prior art references that were not previously considered by the examiner during the application process. Such “new” prior art will strengthen the probability of success in requesting a reexamination of a patent.

You may need to invest in a thorough prior art search to find some good references that will call into question the validity of the claims in the patent.

2-sided vs. 1-sided Patent Challenges: How is “ex parte” different than “inter partes“?

There may be times when companies engaged in fair competition must decide if it makes business sense to challenge patents. When it comes to challenging the validity of patents before the USPTO, proceedings can be either “ex parte” or “inter partes.” Inter partes means between two parties, and thus refers to a two-sided adversarial case. For example, an Inter Partes Review (IPR) involves a challenge of a patent brought before the PTAB. An IPR is litigated between the challenger and the patent owner.

Ex parte, on the other hand, means one-sided or a single party. For example, the patent filing process is ex parte because it involves only the applicant in dealing with the patent examiner. Third parties generally do not get to participate in the patent application process. An ex parte reexamination will not involve the requestor beyond the filing of the request.

How to Challenge a Patent By Requesting an Ex Parte Reexamination with the USPTO

An ex parte reexamination of an issued patent involves only the patent owner and the Patent Office. A third party challenger may file the initial request for reexamination. If a Patent Owner’s Statement is filed, a third party requestor may also submit an optional reply. Beyond that, the third party requestor does not get to participate in the ongoing review of the validity of the patent. If the patent owner were to argue that its claims are still valid over certain prior art, for example, the challenger cannot respond with counterarguments as to why the claims are invalid.

There are three possible outcomes for each claim in a reexamined patent:

  1. confirmed (unchanged);
  2. canceled; or
  3. changed.

USPTO statistics for 2019 show that 91% of requests for reexamination were granted, meaning that the successful requests satisfied the requirement of showing a substantial new question of patentability (SNQ). In reexamination proceedings where the request was filed by a third party (i.e., not the patent owner or the Patent Office), 79% of claims were canceled or changed.

So if you are thinking of requesting reexamination of someone else’s patent, you have over 92% chance of the request being granted and, once granted, an almost 80% of seeing claims canceled or amended. So, a third party requestor has a roughly 73% chance of success in getting patent claims canceled or changed as a result of reexamination.

How much does an ex parte patent reexamination cost?

For a small entity (e.g., business with fewer than 500 employees), the USPTO fee for requesting reexamination is $6,300. However, a streamlined reexamination costs half the price at $3,150 if the request has 40 or less pages and meets other format requirements.

Our firm can provide flat rate estimates for filing an ex parte reexamination request. Attorney’s fees at our firm typically start at $15,000, depending upon the number of claims and prior art references. A higher number of claims will require more work and more pages, which may exceed the 40-page limit of the cheaper streamlined reexamination request.

Need to challenge patents or respond to patent infringement claims?

Request a free initial consultation with US patent attorney Vic Lin by emailing vlin@icaplaw.com to explore how we can help you defend against a patent infringement claim.

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