Inventors patent their inventions for legal and commercial rights. Search Google Patents for the name of an invention and/or inventor and you may find a copy of the original patent. Drawings and descriptions are included with many of the patents in the database.
Go to: http://www.google.com/patents?hl=en
Be aware that many patents are similar in name and design since inventors build upon one another's work. For example you'll find hundreds of patents when you search for "light bulb." To narrow your search down to a reasonable number try Google Patent Advanced Search entering the patent title and/or inventor name.
Go to: https://books.google.com/advanced_patent_search
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