John F. Dreyer

Person

North Oaks, MN, US

People

Patents Grantslast 30 patents

Information Patent Grant
Retroreflectors having two optical surfaces and varying retroreflec...
- Patent number 6,282,026
- Issue date Aug 28, 2001
- 3M Innovative Properties Company
- John F. Dreyer
- G02 - OPTICS
Information Patent Grant
Imaging articles and methods using dual-axis retroreflective elements
- Patent number 6,055,108
- Issue date Apr 25, 2000
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G02 - OPTICS
Information Patent Grant
Electroluminescent display with brightness enhancement
- Patent number 6,052,164
- Issue date Apr 18, 2000
- 3M Innovative Properties Company
- Sanford Cobb
- G02 - OPTICS
Information Patent Grant
Modulating retroreflective article
- Patent number 6,045,230
- Issue date Apr 4, 2000
- 3M Innovative Properties Company
- John F. Dreyer
- B44 - DECORATIVE ARTS
Information Patent Grant
Dual axis retroreflective articles
- Patent number 5,889,615
- Issue date Mar 30, 1999
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G02 - OPTICS
Information Patent Grant
Totally internally reflecting light conduit
- Patent number 5,745,632
- Issue date Apr 28, 1998
- Minnesota Mining and Manufacturing Co.
- John F. Dreyer
- G02 - OPTICS
Information Patent Grant
Line light source including fluorescent colorant
- Patent number 5,700,077
- Issue date Dec 23, 1997
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G02 - OPTICS
Information Patent Grant
Uniform bi-directional dependent line light source via controlled p...
- Patent number 5,692,822
- Issue date Dec 2, 1997
- Minnesota Mining and Manufacturing Co.
- John F. Dreyer
- G02 - OPTICS
Information Patent Grant
Pole light having a programmable footprint
- Patent number 5,575,550
- Issue date Nov 19, 1996
- Minnesota Mining and Manufacturing Company
- Roger H. Appeldorn
- G02 - OPTICS
Information Patent Grant
Projector with multiple lamp light source
- Patent number 5,504,544
- Issue date Apr 2, 1996
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G02 - OPTICS
Information Patent Grant
Conspicuity enhancer
- Patent number 5,497,294
- Issue date Mar 5, 1996
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- E01 - CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
Information Patent Grant
Directed reflection optical device
- Patent number 5,471,348
- Issue date Nov 28, 1995
- Minnesota Mining and Manufacturing Company
- Richard A. Miller
- G02 - OPTICS
Information Patent Grant
Line light source
- Patent number 5,258,896
- Issue date Nov 2, 1993
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Reflective overhead projector with alternate light sources
- Patent number 5,135,301
- Issue date Aug 4, 1992
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Direction dependent line light source
- Patent number 5,043,850
- Issue date Aug 27, 1991
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G02 - OPTICS
Information Patent Grant
Reflective sheeting material
- Patent number 4,989,948
- Issue date Feb 5, 1991
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G02 - OPTICS
Information Patent Grant
High aspect ratio light fixture and film for use therein
- Patent number 4,984,144
- Issue date Jan 8, 1991
- Minnesota Mining and Manufacturing Company
- Sanford Cobb
- G02 - OPTICS
Information Patent Grant
Light fixture providing normalized output
- Patent number 4,791,540
- Issue date Dec 13, 1988
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Automatic focus for overhead projector
- Patent number 4,634,246
- Issue date Jan 6, 1987
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Apparatus and method for converting mechanical wave energy to optic...
- Patent number 3,991,606
- Issue date Nov 16, 1976
- Minnesota Mining and Manufacturing Company
- John F. Dreyer
- G02 - OPTICS

John F. Dreyer

Person

Patents Grantslast 30 patents

Retroreflectors having two optical surfaces and varying retroreflec...

Imaging articles and methods using dual-axis retroreflective elements

Electroluminescent display with brightness enhancement

Modulating retroreflective article

Dual axis retroreflective articles

Totally internally reflecting light conduit

Line light source including fluorescent colorant

Uniform bi-directional dependent line light source via controlled p...

Pole light having a programmable footprint

Projector with multiple lamp light source

Conspicuity enhancer

Directed reflection optical device

Line light source

Reflective overhead projector with alternate light sources

Direction dependent line light source

Reflective sheeting material

High aspect ratio light fixture and film for use therein

Light fixture providing normalized output

Automatic focus for overhead projector

Apparatus and method for converting mechanical wave energy to optic...