Inventor · Plymouth, MN, US

Kenneth A. Haapala

31Patents
9h-index
39Co-inventors
71Inventor score

Filing activity: Jun 20, 2002 → May 22, 2020

Most-cited inventions

PatentTitleAreaCited byStatus
US9142246B1 Apparatus and methods to reduce hard disk drive manufacturing test time Physics 58 Active
US9361919B1 Disk drive with parallel head actuation Physics 38 Active
US9911442B1 Feedforward compensation for multi-actuator hard drives Physics 36 Active
US8638349B1 Head-medium contact detection using introduced heat oscillation Physics 16 Active
US10431246B2 Dual actuator storage device utilizing multiple disk zones Physics 14 Active
US9818445B2 Magnetic storage device readers Physics 11 Active
US6937442B2 Contacting point damping method between flex circuit and pivot housing Physics 10 Expired
US10741210B1 Magnetic disk device having coupling observers for reducing coupling issues between independently running multi-actuators Physics 10 Active
US10964345B1 Parallel servo control in a data storage device Physics 9 Active
US9508370B1 Repeated runout (RRO) compensation for alternating tracks in an interlaced magnetic recording system Physics 8 Active
US9858961B2 Reader design for interlaced magnetic recording Physics 8 Active
US9396750B2 Near-field transducer efficiency monitoring system Physics 6 Active
US7046478B2 Method and apparatus for reducing vibration in a dynamic system Physics 5 Expired
US9142244B2 Near-field transducer efficiency monitoring system Physics 5 Active
US9311940B1 Multiple head control using common and differential position error signals Physics 5 Active
US10629238B1 Managing storage device media data rates Physics 5 Active
US9047898B2 Head-medium contact detection using introduced heat oscillation Physics 5 Active
US9495995B1 Adjusting laser power to achieve equivalent track spacing for paired heads that simultaneously write to a heat-assisted recording medium Physics 4 Active
US9502063B1 Apparatus and method for measuring slider fly height relative to bit patterned media Physics 3 Active
US10783910B2 Dual actuator storage device utilizing multiple disk zones Physics 3 Active
US9761258B2 Servo parameterization for multi-sensor reader Physics 2 Active
US9691418B1 Adaptive write fault thresholds Physics 2 Active
US9741379B1 Methods and devices for track seeking using microactuators Physics 2 Active
US7885033B2 Anticipatory track switching Physics 1 Active
US10366719B1 Boosted preheat trajectory to obtain desired clearance before writing to disk Physics 1 Active

Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.