For example, a king might bestow a patent on salt to a trusted ally. Here are the chapter summaries for Rules of Patent Drafting: Guidelines from Federal Circuit Case Law.Prior to writing claim answer these questions: • What is the invention? • What are the pieces and parts that make up the invention? A priority claim is made to an earlierfiled patent application. For example, an Applicant can claim priority in a later-filed patent application. A fundamental principle of patent application drafting is that the patent applicant can be his or her own lexicographer. Patent litigation is a growth industry. Provide examples of patentable and non-patentable inventions. Explain the concept of prior art and its importance in patent searches.