Inventor

Leonardus J. Grassens

Inventor

Monument, CO, US

Overview

20→

Patents

1987–2003

Patent span

Physics

Primary field (CPC G)

Patents· 20 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 transducer50%

H02KDynamo-electric machines31%

G02BOptical elements, systems or apparatus8%

A61BDiagnosis3%

A61NElectrotherapy3%

B23PMetal-working not otherwise provided for3%

H02BBoards, substations or switching arrangements for the supply or distribution of electric power3%

PatentTitleYear

6,532,199'Optical actuator assembly with lens position sensor for recording or playback'2003 6,266,306'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'2001 6,243,336'Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal and focus capture method for use in same'2001 6,141,300'Optical actuator including lens assembly with optical axis having symmetric suspensory forces acting thereon and optical disc system including same'2000 6,122,232'Isolation apparatus for use in disc drive system to mitigate effects of undesired mechanical forces and disc drive system including same'2000 6,058,081'Optical drive system having servomotor operated relative to maximum quad sum signal'2000 6,023,379'Method and apparatus for aligning an objective lens'2000 5,808,980'Seek actuator for optical recording'1998 5,790,325'Method and apparatus for focusing a lens'1998 5,768,035'Method and apparatus for aligning an objective lens'1998 5,729,511'Optical disc system having servo motor and servo error detection assembly operated relative to monitored quad sum signal'1998 5,708,633'Method and apparatus for manufacturing information storage devices'1998 5,532,989'Seek actuator for optical recording'1996 5,313,332'Flexure suspension for two axis actuator'1994 5,265,079'Seek actuator for optical recording'1993 5,177,640'Two-axis moving coil actuator'1993 5,136,558'Two axis electromagnetic actuator'1992 4,945,526'Actuator assembly for optical disk systems'1990 4,885,998'Patient support system for radiotherapy'1989 4,683,520'Mechanical shock mount system for electrical apparatus'1987

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1987–1990Patents assigned to LASER MAGNETIC STORAGE INT (2)· patent assignee history

1987–1990Based in Colorado Springs, CO, US· patent location history

1989Patents assigned to PHILIPS CORP (1)· patent assignee history

1989–2003Based in Chipita Park, CO, US· patent location history

1992–1994Patents assigned to APPLIED MAGNETICS CORP (4)· patent assignee history

1993–2001Based in Monument, CO, US· patent location history

1996–2003Patents assigned to DISCOVISION ASS (13)· patent assignee history

1998–2001Based in Loveland, CO, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
DISCOVISION ASS	13	1996–2003
APPLIED MAGNETICS CORP	4	1992–1994
LASER MAGNETIC STORAGE INT	2	1987–1990
PHILIPS CORP	1	1989

Locations

Location	Patents	Span
Monument, CO, US	9	1993–2001
Chipita Park, CO, US	6	1989–2003
Loveland, CO, US	3	1998–2001
Colorado Springs, CO, US	2	1987–1990