Free access to U.S. patent database which is complete back to 1974. Searchable by simple keywords, Boolean keywords, patent number, etc. The page which has the information for the patent may be a little confusing at first. Letter to libraries online. An outstanding tutorial that will teach the user how to find information about companies by using the World Wide Web.
All sources covered are free of charge.
Packed with helpful information about small business, this site includes a business plan tutorial. Online version of directory of business information. You can look up a particular kind of manufactured goods, e.g., Zoo Equipment, and find out who manufactures it. Some manufacturer's catalogs can be viewed here. Free, but you must register to use it the first time.