Film evidence challenges BT's claim to hypertext patent Patents9/16/2000; 11:56:06 AM 'BT's tight-fisted grasp on the patent for hyperlinks could be about to slacken following an intriguing posting on Nerd site, Slashdot.'Apparently, on December 9, 1968, Douglas C Engelbart and 17 researchers at the Augmentation Research Center, Stanford Research Institute, in Menlo Park, California presented a 90-minute live public demo in which hypertext was wheeled out for all to see.'Real Player video and a link to the Slashdot discussion is at the site.