Need help in filing for a patent to protect your invention? Our patent litigation attorneys can help!Calfee's patent lawyers assist with the preparation and prosecution of patents for a variety of industries, covering all disciplines. The patent attorneys of Wenstler LLC offer patent application, prosecution, due diligence and infringement opinions for U.S. and international clients. You cannot sue for infringement until the European patent application has been granted. A European patent only protects you in the European countries that you selected and paid for. Same for all other countries or regions. My patent protection applies only in the country or countries where my patent issues. For example, if I have patent for a product in the United States only. Learn more about registering a patent and how to gain exclusive rights over your invention for a certain period of time.