The answer is money. This page provides information on the types of patents and types of patent applications, and the examination process.The cost is inexpensive compared to the cost to prepare and file a U.S. patent application. Plus, no examination of the patent application takes place. You must provide and keep current your domicile address in trademark filings. Looking for a San Diego patent attorney that will work with your budget and provide the best service possible? Call Alloy Patent Law for free consultations. Interested in filing a patent? Our team of experienced attorneys and patent agent are here to help. Although trademarks are also filed with the USPTO, an attorney can file a trademark with the USPTO without taking the patent bar.