Here's a link to the patent at the USPTO. Google patents is by far the easier search, but their OCR makes a mess of some documents. USPTO is almost unsearchable if you don't have the number. But they have the actual document as a PDF - Click on images, then on the full pages button to get to the PDF - The USPTO link is so long the board software doesn't seem to recognize it.
http://patft.uspto.gov/netacgi/nph-P...5&RS=2,131,825