Robert P. Ryan
91Patents
36h-index
77Co-inventors
91Inventor score
Filing activity: Jul 22, 1981 → Aug 4, 2023
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US7203021B1 | Self-heating disk drive | Physics | 174 | Expired |
| US6795268B1 | Disk drive employing seek time vcm ir voltage calibration for velocity control of an actuator arm | Physics | 142 | Expired |
| US8370683B1 | System and method to reduce write splice failures | Physics | 134 | Active |
| US6104153A | Disk drive employing method of spinning down its spindle motor to reduce the time required for spinning it down and subsequently spinning it up | Physics | 133 | Expired |
| US6476996B1 | Disk drive comprising an actuator driver circuit for retracting a head independent of a servo microprocessor when a spindle speed fault mode is detected | Physics | 133 | Expired |
| US7907364B2 | Disk drive including a delay circuit to provide a delayed reset signal | Physics | 132 | Active |
| US6198590A | Disk drive employing method of spinning down its spindle motor to reduce the time required for subsequently spinning it up | Physics | 130 | Expired |
| US6538839B1 | Disk drive employing adaptive feed-forward vibration compensation to enhance a retry operation | Physics | 130 | Expired |
| US6690536B1 | Disk drive employing VCM demand current to calibrate VCM IR voltage for velocity control of an actuator arm | Physics | 129 | Expired |
| US6577465B1 | Disk drive comprising spin down circuitry having a programmable signal generator for enhancing power and braking control | Physics | 127 | Expired |
| US6574062B1 | Disk drive comprising a demand limit circuit for enhancing power management during spin down | Physics | 125 | Expired |
| US6970319B1 | Disk drive comprising a pulse width modulated demand limit circuit for enhancing power management during spin-down | Physics | 125 | Expired |
| US6549359B1 | Disk drive comprising spin down circuitry having a current limit circuit for enhancing power and braking control | Physics | 125 | Expired |
| US6549361B1 | Disk drive comprising spin down circuitry having a power clamp circuit for enhancing power and braking control | Physics | 123 | Expired |
| US6934135B1 | Disk drive monitoring a supply current to protect motor driver circuits | Physics | 120 | Expired |
| US7548392B1 | Disk drive controlling a voice coil motor during an emergency unload | Physics | 119 | Active |
| US8179626B1 | Adaptive shock detection | Physics | 118 | Active |
| US6967458B1 | Decreasing spin up time in a disk drive by adjusting a duty cycle of a spindle motor PWM signal to maintain constant average input current | Physics | 117 | Expired |
| US6867944B1 | Disk drive comprising VCM stall detector for velocity control of an actuator arm | Physics | 117 | Expired |
| US6900959B1 | Disk drive comprising an offset-nulling amplifier for detecting a back EMF voltage of a voice coil motor | Physics | 115 | Expired |
| US7158329B1 | Disk drive employing active braking using inductive sense | Electricity | 115 | Expired |
| US7852588B1 | Disk drive adjusting gain of shock detector relative to resonant frequency amplitude | Physics | 114 | Active |
| US7095579B1 | Disk drive employing momentum based unload during power failure | Physics | 113 | Expired |
| US6560056B1 | Disk drive comprising a motor driver IC employing a serial interface for initiating the transmission of real-time status data to a controller IC | Physics | 113 | Expired |
| US6788483B1 | Disk drive comprising a programmable inverting voltage regulator configured relative to the disk drive's mode of operation | Physics | 112 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.