Most first-in first-out (FIFO) storage devices are variable-length buffers in that the input rate may be variable while the output rate is constant or the output rate may be variable while the input rate is constant. Various clocking and control systems are used to allow control of underflow or overflow conditions.
US Patent Issued to KHD Humboldt Wedag on May 14 for "Feed Device with Two Rotary Valves Which Are Variable Independently of Each Other" (German Inventor)
May 14, 2013; ALEXANDRIA, Va., May 14 -- United States Patent no. 8,439,288, issued on May 14, was assigned to KHD Humboldt Wedag GmbH...