Inventor

John F. Dreyer, Jr.

Inventor

North Oaks, MN, US

Overview

21→

Patents

1976–2001

Patent span

Physics

Primary field (CPC G)

Patents· 21 as inventor

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

G02Bprimary

G02BOptical elements, systems or apparatus33%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests15%

F21VFunctional features or details of lighting devices or systems thereof11%

G03BApparatus or arrangements for taking photographs or for projecting or viewing them9%

F21SNon-portable lighting devices7%

F21WIndexing scheme associated with subclasses f21k, f21l, f21s and f21v, relating to uses or applications of lighting devices or systems7%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein4%

A47CChairs2%

A61BDiagnosis2%

B44FSpecial designs or pictures2%

PatentTitleYear

6,282,026'Retroreflectors having two optical surfaces and varying retroreflectivity'2001 6,055,108'Imaging articles and methods using dual-axis retroreflective elements'2000 6,052,164'Electroluminescent display with brightness enhancement'2000 6,045,230'Modulating retroreflective article'2000 5,889,615'Dual axis retroreflective articles'1999 5,745,632'Totally internally reflecting light conduit'1998 5,700,077'Line light source including fluorescent colorant'1997 5,692,822'Uniform bi-directional dependent line light source via controlled partial reflection'1997 5,575,550'Pole light having a programmable footprint'1996 5,504,544'Projector with multiple lamp light source'1996 5,497,294'Conspicuity enhancer'1996 5,471,348'Directed reflection optical device'1995 5,258,896'Line light source'1993 5,135,301'Reflective overhead projector with alternate light sources'1992 5,043,850'Direction dependent line light source'1991 5,020,173'Bedstead storage box'1991 4,989,948'Reflective sheeting material'1991 4,984,144'High aspect ratio light fixture and film for use therein'1991 4,791,540'Light fixture providing normalized output'1988 4,634,246'Automatic focus for overhead projector'1987 3,991,606'Apparatus and method for converting mechanical wave energy to optical energy'1976

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1976–2000Patents assigned to MINNESOTA MINING & MFG (17)· patent assignee history

1976Based in Cincinnati, OH, US· patent location history

1987–2001Based in North Oaks, MN, US· patent location history

1988–1996Based in St. Paul, MN, US· patent location history

1991Patents assigned to DREYER JR JOHN F (1)· patent assignee history

1998Based in Ramsey, MN, US· patent location history

2000–2001Patents assigned to 3M INNOVATIVE PROPERTIES CO (3)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
MINNESOTA MINING & MFG	17	1976–2000
3M INNOVATIVE PROPERTIES CO	3	2000–2001
DREYER JR JOHN Fself	1	1991

Locations

Location	Patents	Span
North Oaks, Minnesota, US	14	1987–2001
St. Paul, Minnesota, US	5	1988–1996
Ramsey, Minnesota, US	1	1998
Cincinnati, OH, US	1	1976