905 Patents Issued For Clients
701 Trademarks Issued or Filed for Clients

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Patent Lawyer in California, Florida, Illinois, New York, Texas, Wisconsin - All 50 States

Patent & Trademark Services

  • Patent writing and filing
  • Patent searching and evaluation
  • Patent infringement opinions
  • Patent litigation
  • Trademark filing
  • Trademark searching
  • Advice for "designing around" patented products
  • Pro se Patent Help
  • Pro se Trademark Help
  • Agent for filing patent application papers
  • Agent for signing trademark papers

About

US Patent Law Attorney in WI, CA, FL, IL, NY, TX | IP Patent Attorney

Don Ersler is a patent attorney with 30 years of experience in patent law, plus bachelor degrees in mechanical and electronic engineering, 12 years of engineering experience, and a juris doctor degree in law. As an experienced patent lawyer, Don has the know-how and skills to write the strongest possible patent application, avoid prior patents, and work around prior art. He will protect your invention or idea.

In addition, Mr. Ersler can provide assistance with intellectual patents as an IP patent attorney. All technologies are applicable to patent law, and Don Ersler can offer the necessary guidance to assure your patents are registered and filed accurately and completely at a reasonable price.

As your patent agent, Don will quote a flat fee for all legal needs related to obtaining your patent, such as Invention Licensing, so you will know all legal costs before you start. Don works with inventors, design departments, and corporate attorneys in the USA and around the world from his office near Milwaukee, Wisconsin.

Previous clients have included inventors needing patents from California, Illinois, New York, Texas, Wisconsin... all corners of the United States and through the world. If you need a patent attorney who is not only an experienced lawyer, but also holds college degrees in the areas of mechanical and electrical engineering for most inventions, you will enjoy working with Don Ersler.


If you need a patent attorney with engineering experience, who understands the functionality of your invention, and will ask questions about why your invention is an improvement over existing technology, then Don is your patent attorney.  A number of clients have commented that Don understands their invention, but other patent attorneys (including those from large law firms) do not. 


See Don at 12: 49 on How to Patent & Prototype an Idea, Scott Wadsworth, Essential Craftsman, https://www.youtube.com/watch?v=Y3xfgTrRrpw

Scott Wadsworth patent no. D1007993 and Formsetter trademark Reg. No. 7493859

Testimonials

Carl L. Ricciardi President and General Counsel Altapure, LLC

Until we engaged Don Ersler as patent counsel our experience with several other firms had been, in the main, disappointing. His expertise in the fields of mechanical and electrical engineering coupled with his quick grasp of complicated issues result...

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Mark Zagorski Applications Engineer International Cutting Dies

I have worked with Don Ersler on numerous patent applications. The most important consideration of working with Don is the ease of communication. He always responds in a timely fashion. You do not have to wait weeks for a response to a question! ...

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