Inventor

J. David Margerum

Inventor

Woodland Hills, CA, US

Overview

18→

Patents

1977–2001

Patent span

Physics

Primary field (CPC G)

Patents· 18 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G02Fprimary

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein26%

C09KMaterials for miscellaneous applications, not provided for elsewhere23%

H01QAntennas, i.e. radio aerials10%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests10%

H03CModulation6%

A61BDiagnosis3%

G02BOptical elements, systems or apparatus3%

G03CPhotosensitive materials for photographic purposes3%

G03FPhotomechanical production of textured or patterned surfaces, e.g. for printing, for processing of semiconductor devices3%

H01MProcesses or means, e.g. batteries, for the direct conversion of chemical energy into electrical energy3%

PatentTitleYear

6,273,921'Battery fabrication method using supercritical carbon dioxide'2001 5,729,242'Dual PDLC-projection head-up display'1998 5,650,787'Scanning antenna with solid rotating anisotropic core'1997 5,338,481'Asymmetrical nonpolar diphenyl-diacetylene liquid crystals eutectic mixtures'1994 5,194,972'Microwave phase modulation with liquid crystals'1993 5,184,233'Liquid crystal-based composite material including electrically conducting elongated particles and having enhanced microwave birefringence'1993 5,170,271'Shaped voltage pulse method for operating a polymer dispersed liquid crystal cell, and light valve employing the same'1992 5,099,343'Edge-illuminated liquid crystal display devices'1992 5,096,282'Polymer dispersed liquid crystal film devices'1992 5,011,267'Method for tilted alignment of liquid crystals with improved photostability'1991 4,944,576'Film with partial pre-alignment of polymer dispersed liquid crystals for electro-optical devices, and method of forming the same'1990 4,938,568'Polymer dispersed liquid crystal film devices, and method of forming the same'1990 4,917,472'Light valves with positive dielectric anisotropy liquid crystal and highly tilted off-perpendicular surface alignment, and associated operating method'1990 4,464,134'Process for inducing perpendicular alignment of liquid crystals'1984 4,428,380'Method and improved apparatus for analyzing activity'1984 4,427,569'Short length ester liquid crystal mixtures and process for making same'1984 4,225,454'Ortho-cyanophenyl biphenylcarboxylate liquid crystal esters and mixtures thereof'1980 4,036,647'Package for making photopolymerized plates'1977

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1977–1998Patents assigned to HUGHES AIRCRAFT CO (17)· patent assignee history

1977–2001Based in Woodland Hills, CA, US· patent location history

1992Patents assigned to DELCO ELECTRONICS CORP (1)· patent assignee history

1992Patents assigned to GEN MOTORS CORP (1)· patent assignee history

1994Patents assigned to UNIV SOUTHERN CALIFORNIA USC (1)· patent assignee history

2001Patents assigned to BOEING CO (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
HUGHES AIRCRAFT CO	17	1977–1998
BOEING CO	1	2001
DELCO ELECTRONICS CORP	1	1992
GEN MOTORS CORP	1	1992
UNIV SOUTHERN CALIFORNIA USC	1	1994

Locations

Location	Patents	Span
Woodland Hills, California, US	18	1977–2001