Technical Report Archive and Image Library A collaborative project to digitize, archive, and provide persistent and unrestricted access to federal technical reports issued prior to 1975.
The National Technical Information Service serves as the largest central resource for government-funded scientific, technical, engineering, and business related information available today.
The Defense Technical Information Center (DTIC®) serves the DoD community as the largest central resource for DoD and government-funded scientific, technical, engineering, and business related information available today .
Science.gov searches over 40 databases and 1,950 selected websites, offering 200 million pages of authoritative U.S. government science information, including research and development results.
WorldWideScience.org is a global science gateway—accelerating scientific discovery and progress through a multilateral partnership to enable federated searching of national and international scientific databases and portals.
U.S. Patent & Trademarks Office (USPTO)
The U.S. Patents from 1790 to the most current submissions are available on the from the USPTO website in full-text.
Google provides a google interface to explore the USPTO patent database.
Offers international coverage, though not comprehensive.