View this article at: http://dev.macnn.com/articles/07/09/27/three.apple.patents Thursday, Sep 27, 2007 3:20pm Apple's iCard, display mani... Three of Apple's latest publicly known patent applications surfaced today, detailing eCards from multiple users as well as a potential Mac OS X Leopard feature and data processing file systems. Apple's iCard patent relates the the company's iCard program by introducing a new group-signing capability to iCards, enabling multiple users to personalize and sign an eCard in the same fashion as is done with physical greeting cards. Another patent, titled "Methods of manipulating a screen space of a display device," may relate to the company's Mac OS X 10.5 Leopard Spaces technology as it describes managing multiple windows on a single screen. Another patent application titled "File systems for data processing systems" describes the file system of a computer operating system, which serve to ensure systems like Mac OS X properly handle tasks like linking all files and directories.