Patent law is always an area of exclusive federal jurisdiction.
Explanation: Patent law is exclusively federal in nature.
Even though no one else had developed an invention like that of the patent applicant,the application will be denied if,at the time of the invention,the invention would have been obvious to a person having ordinary skills in the area.
A patent granted on September 2,1997 will be valid for 17 years from that date unless the patent was for an ornamental design.
A patent can be transferred through an assignment to another party.