Update 2010-07-21-pdd-patent.md

Line 22 - added the article "the"
Line 46 - added a comma.
Line 49 - deleted the "s" from the word becomes.
Line 51 - added a comma after the word discussions.
Line 51 - replaced the comma with a semicolon after the word moreover.
Merge pull request #18 from toddbeuk/master

Update 2010-07-21-pdd-patent.md