Patent opinions and evaluations are used in virtually all aspects of patent law, including litigation, prosecution, licensing, product design, product launch, and evaluation and acquisition of intellectual property. This volume provides a practice-oriented, complete and up-to-date guide for preparing such opinions and evaluations for all purposes. The title squarely addresses the practical needs of the practicing attorney preparing a patent opinion, including discussions and current law along with specific "practice tips" to provide practical advice and guidance in specific situations. It includes both general issues-such as an overview of opinions, including various uses and forms, rules and requirements for preparing competent opinions, and timing, necessity of, reliance on, and waiver related to opinions-to nuts-and-bolts issues, such as claim construction and claim scope, infringement, validity and enforceability. "Practice Tips" and appendices provide further practical guidance by setting forth exemplary outlines of opinions and evaluations, and a subject-matter index enables quick and easy use of the book as a reference for specific topics.