Chemistry Formulas Chart 8 x 10 DIGITAL DOWNLOAD This is a DIGITAL DOWNLOAD you will be sent a link to your email to download the files that you print yourself 300 dpi Reproduction - Not Original If you’re looking for some unusual art for your office or home look no further! Many patent drawings are true works of art, and all US patents published before March 1st 1989 are public domain, meaning you can download and print them to your hearts content.