David L. Schell
40Patents
15h-index
39Co-inventors
81Inventor score
Filing activity: May 28, 1986 → Jun 24, 2013
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6986098B2 | Method of reducing miscorrections in a post-processor using column parity checks | Electricity | 170 | Expired |
| US5729511A | Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal | Electricity | 83 | Expired |
| US5875158A | Servo control system for information storage device | Electricity | 79 | Expired |
| US6122232A | Isolation apparatus for use in disc drive system to mitigate effects of undesired mechanical forces and disc drive system including same | Electricity | 71 | Expired |
| US5313332A | Flexure suspension for two axis actuator | Physics | 69 | Expired |
| US5136558A | Two axis electromagnetic actuator | Electricity | 64 | Expired |
| US5748578A | Colpitts type oscillator having reduced ringing and improved optical disc system utilizing same | Electricity | 59 | Expired |
| US6087644A | Focus capture for optical disc system including detection of quad sum signal to close focus | Electricity | 53 | Expired |
| US4907212A | Method and apparatus for calibrating an optical disk system | Physics | 33 | Expired |
| US5878015A | Laser driver for controlling electrical current passed to a laser in an optical disc system | Electricity | 27 | Expired |
| US4779253A | Sampled servo for an optical disk drive | Physics | 24 | Expired |
| US5920539A | Apparatus and method for suppression of electromagnetic emissions having a groove on an external surface for passing an electrical conductor | Electricity | 18 | Expired |
| US6434087B1 | Optical disc system and method for controlling bias coil and light source to process information on a storage medium | Physics | 18 | Expired |
| US4855977A | Track seeking apparatus and method using sampled information | Physics | 16 | Expired |
| US6069857A | Optical disc system having improved circuitry for performing blank sector check on readable disc | Physics | 16 | Expired |
| US6586968B1 | Programmable bit ordering for serial port | Physics | 15 | Expired |
| US6278665A | Optical disc system including current monitoring circuit assembly having controller with improved optics module and laser driver and method for operating same | Electricity | 14 | Expired |
| US6266306A | Analog to digital converter and assembly for use in optical drive system to normalize servo error signals and multiplex reference voltage inputs and digital outputs | Electricity | 14 | Expired |
| US5796703A | Apparatus for controlling an electrical current passed to a writing device in an optical storage system | Electricity | 13 | Expired |
| US6091684A | Optical disc system and method for changing the rotational rate of an information storage medium | Physics | 11 | Expired |
| US6236625A | Optical disc system having current monitoring circuit with controller for laser driver and method for operating same | Physics | 11 | Expired |
| US6418097B1 | Analog to digital converter assembly for normalizing servo error signals and multiplexing reference voltage inputs and digital outputs and improved optical drive system including same | Electricity | 11 | Expired |
| US4914645A | Optical disk tracking and seeking systems and specific track formats using servo areas | Physics | 11 | Expired |
| US4864552A | Driving signal for coarse servo employing sampled offset signal | Physics | 10 | Expired |
| US5828054A | Focusing method and system for focus capture and focus control in optical disc system including detection of Quad Sum signal to close focus | Electricity | 9 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.