Columbia subject headings:
Inventors--Legal status, laws, etc.--United States.
Patent laws and legislation--United States.
Patents--United States.
Harvard subject headings:
Inventors--Legal status, laws, etc.--United States.
Patent laws and legislation--United States.
Patents--United States
Princeton subject headings:
Inventors--Legal status, laws, etc.--United States.
Patent laws and legislation--United States.
Patents--United States.