David C. Weigel

Person

St. Paul, MN, US

People

Patents Grantslast 30 patents

Information Patent Grant
Positive imaging diffusion-transfer dry silver system using formaza...
- Patent number 5,278,024
- Issue date Jan 11, 1994
- Minnesota Mining and Manufacturing Company
- Richard C. Cotner
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Thermal development accelerators for thermographic materials
- Patent number 5,275,932
- Issue date Jan 4, 1994
- Minnesota Mining and Manufacturing Company
- David C. Weigel
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Positive imaging diffusion - transfer dry silver system
- Patent number 5,206,112
- Issue date Apr 27, 1993
- Minnesota Mining and Manufacturing Company
- Richard C. Cotner
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Dry silver systems with fluoran leuco dyes
- Patent number 5,185,231
- Issue date Feb 9, 1993
- Minnesota Mining and Manufacturing Company
- David C. Weigel
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Color photothermographic materials with development accelerator
- Patent number 5,026,633
- Issue date Jun 25, 1991
- Minnesota Mining and Manufacturing Company
- David C. Weigel
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Color photothermographic elements
- Patent number 4,923,792
- Issue date May 8, 1990
- Minnesota Mining and Manufacturing Company
- Duncan M. A. Grieve
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Color photothermographic elements
- Patent number 4,883,747
- Issue date Nov 28, 1989
- Minnesota Mining and Manufacturing Company
- Duncan M. A. Grieve
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Stabilization of ketazine dyes
- Patent number 4,795,697
- Issue date Jan 3, 1989
- Minnesota Mining and Manufacturing Company
- Kim M. Vogel
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Photohermographic emulsions having stable color forming developers
- Patent number 4,782,010
- Issue date Nov 1, 1988
- Minnesota Mining and Manufacturing Company
- Roger A. Mader
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Photothermographic stabilizers for syringaldazine leuco dyes
- Patent number 4,587,211
- Issue date May 6, 1986
- Minnesota Mining and Manufacturing Company
- Takuzo Ishida
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Photothermographic toners
- Patent number 4,585,734
- Issue date Apr 29, 1986
- Minnesota Mining and Manufacturing Company
- David C. Weigel
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Indicator material
- Patent number 4,328,181
- Issue date May 4, 1982
- Minnesota Mining and Manufacturing Co.
- Leon W. Anders
- G01 - MEASURING TESTING

David C. Weigel

Person

Patents Grantslast 30 patents

Positive imaging diffusion-transfer dry silver system using formaza...

Thermal development accelerators for thermographic materials

Positive imaging diffusion - transfer dry silver system

Dry silver systems with fluoran leuco dyes

Color photothermographic materials with development accelerator

Color photothermographic elements

Color photothermographic elements

Stabilization of ketazine dyes

Photohermographic emulsions having stable color forming developers

Photothermographic stabilizers for syringaldazine leuco dyes

Photothermographic toners

Indicator material