http://www.pat2pdf.org/ is a website where you can enter a patent number and fetch a file in a .pdf format. Mostly one can search a desired patent/application on USPTO but when it comes to usability and saving the application it becomes a difficult task. http://www.pat2pdf.org/ is a voluntary programme that is working for several years over the internet. This site is specifically focussed on USPTO patent search. Here one can search MPEP online. The owners of this site have appealed users to support with funds to make it more and more interactive.