In the United States, patent laws vary from state to state or even from jurisdiction to jurisdiction. Thus, California patent laws are unique to California. California patent laws are still both clearly defined and as technically difficult as other states. Patent infringement is basically defined the same everywhere.
The manufacture, use, sale, offer to sell, or import and existing or patented device, product, material, or other conceivable invention constitutes patent infringement. Patent infringement lawyers basically have three jobs.