Robert P. Held

Person

Englishtown, NJ, US

People

Patents Grantslast 30 patents

Information Patent Grant
Reactive media-ink system for ink jet printing
- Patent number 5,537,137
- Issue date Jul 16, 1996
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Reactive media-ink system for ink jet printing
- Patent number 5,429,860
- Issue date Jul 4, 1995
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- B41 - PRINTING LINING MACHINES TYPEWRITERS STAMPS
Information Patent Grant
Process for detackifying transferred toned images
- Patent number 5,314,784
- Issue date May 24, 1994
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Ultraviolet curable heat activatable transfer toners
- Patent number 5,275,918
- Issue date Jan 4, 1994
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Transfer process using ultraviolet curable, non-prolonged tack toni...
- Patent number 5,250,387
- Issue date Oct 5, 1993
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Curable, heat activatable transfer toners
- Patent number 5,240,814
- Issue date Aug 31, 1993
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Positive-working, low silver wash-off contact film
- Patent number 5,227,278
- Issue date Jul 13, 1993
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process for detackifying transferred toned images
- Patent number 5,219,702
- Issue date Jun 15, 1993
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Non-electroscopic prolonged tack toners
- Patent number 5,039,588
- Issue date Aug 13, 1991
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Silver halide wash-out elements
- Patent number 4,948,701
- Issue date Aug 14, 1990
- E. I. DuPont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Negative working low silver wash-off contact film
- Patent number 4,923,389
- Issue date May 8, 1990
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process for preparing negative images on a positive-type tonable ph...
- Patent number 4,869,996
- Issue date Sep 26, 1989
- E. I. Du Pont de Nemours and Company
- Peter J. McCartin
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process for making lithographic film using photopolymer diffusion m...
- Patent number 4,654,296
- Issue date Mar 31, 1987
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process for etching nonphotosensitive layer under washoff photopoly...
- Patent number 4,584,261
- Issue date Apr 22, 1986
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Imageable colloidal metal/mercaptan elements
- Patent number 4,579,808
- Issue date Apr 1, 1986
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process for image formation utilizing chemically soluble pigments
- Patent number 4,567,129
- Issue date Jan 28, 1986
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process for etching single photopolymer layer utilizing chemically...
- Patent number 4,567,130
- Issue date Jan 28, 1986
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Process for dot etching acid soluble photopolymerizable elements ut...
- Patent number 4,565,770
- Issue date Jan 21, 1986
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Prolonged tack toners for the preparation of electric circuits
- Patent number 4,469,625
- Issue date Sep 4, 1984
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Multiple transfer of tacky image areas using prolonged tack toners
- Patent number 4,461,823
- Issue date Jul 24, 1984
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Preparation of a printing master by toning a photopolymer film with...
- Patent number 4,416,968
- Issue date Nov 22, 1983
- E. I. Du Pont de Nemours & Co.
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Photopolymerized elements having selectively dye absorbed hydrophil...
- Patent number 4,264,692
- Issue date Apr 28, 1981
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Method for preparation of lithographic printing plate having additi...
- Patent number 4,198,236
- Issue date Apr 15, 1980
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Lithographic printing plate having addition polymerized areas and b...
- Patent number 4,147,549
- Issue date Apr 3, 1979
- E. I. Du Pont de Nemours and Company
- Robert P. Held
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY

Robert P. Held

Person

Patents Grantslast 30 patents

Reactive media-ink system for ink jet printing

Reactive media-ink system for ink jet printing

Process for detackifying transferred toned images

Ultraviolet curable heat activatable transfer toners

Transfer process using ultraviolet curable, non-prolonged tack toni...

Curable, heat activatable transfer toners

Positive-working, low silver wash-off contact film

Process for detackifying transferred toned images

Non-electroscopic prolonged tack toners

Silver halide wash-out elements

Negative working low silver wash-off contact film

Process for preparing negative images on a positive-type tonable ph...

Process for making lithographic film using photopolymer diffusion m...

Process for etching nonphotosensitive layer under washoff photopoly...

Imageable colloidal metal/mercaptan elements

Process for image formation utilizing chemically soluble pigments

Process for etching single photopolymer layer utilizing chemically...

Process for dot etching acid soluble photopolymerizable elements ut...

Prolonged tack toners for the preparation of electric circuits

Multiple transfer of tacky image areas using prolonged tack toners

Preparation of a printing master by toning a photopolymer film with...

Photopolymerized elements having selectively dye absorbed hydrophil...

Method for preparation of lithographic printing plate having additi...

Lithographic printing plate having addition polymerized areas and b...