Pre-compiled Legislative Histories related to United States Patent Law are available on:
HeinOnline: Intellectual Property Law Collection.
-- Includes patent law Arnold & Porter Compiled Legislative Histories, Covington and Burling Compiled Legislative Histories, and Government Printing Office Legislative Histories & Studies,
ProQuest Legislative Insight
-- Provides Compilations of Legislative Histories covering the Patent Act of 1790 - the latest patent law acts. Includes links to Supreme Court Case Histories related to the patent law acts.