AT&T; Warns About Possible Patent Violations: American...

AT&T; Warns About Possible Patent Violations: American Telephone & Telegraph said it has notified various computer companies recently that they may be using its patented computer windowing technology and should be paying licensing fees. Windowing technology allows computers to display several programs at once in separate “windows,” or boxes, on the screen. It was popularized by Apple Computer’s Macintosh and since has been added to International Business Machines models and compatibles through such software as Microsoft Corp.’s Windows. AT&T; received a patent in 1985 for windowing technology.