Inventor
Randolph H. Graham
Inventor
Fremont, CA, US
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer44%
G06FElectric digital data processing31%
G01DMeasuring not specially adapted for a specific variable13%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests13%
PatentTitleYear
5,379,439'Fixed disk drive mounted to printed circuit board'19954,914,530'Media defect management within disk drive sector format'19904,882,671'Microprocessor controlled rigid disk file subsystem'19894,860,194'A method for using a modular unitary disk file subsystem'19894,819,153'Microprocessor controlled rigid disk file subsystem'19894,647,769'Optical encoder having controllable lead-lag phase trim sensitivity'19874,639,863'Modular unitary disk file subsystem'19874,639,798'Disk drive having two interactive electromechanical control subsystems'19874,593,194'Optical encoder with digital gain compensation controlling source intensity'1986Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1986–1995Patents assigned to QUANTUM CORP (4)· patent assignee history
1986–1987Based in San Jose, CA, US· patent location history
1987–1990Patents assigned to PLUS DEV CORP (5)· patent assignee history
1987–1995Based in Fremont, CA, US· patent location history
1987Based in Santa Clara, CA, US· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| PLUS DEV CORP | 5 | 1987–1990 |
| QUANTUM CORP | 4 | 1986–1995 |
Locations
| Location | Patents | Span |
|---|---|---|
| Fremont, California, US | 6 | 1987–1995 |
| San Jose, California, US | 2 | 1986–1987 |
| Santa Clara, California, US | 1 | 1987 |