Paul D Vandervalk

US Patent:

56816774, Oct 28, 1997

Filed:

Feb 12, 1996

Appl. No.:

8/598597

Inventors:

Douglas E. Bugner - Rochester NY
Paul D. Vandervalk - Rochester NY
Marie B. O'Regan - Rochester NY
Hal E. Wright - Johns Island SC

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G 514

US Classification:

430 58

Abstract:

The photoconductive element of the invention comprises an electrically conductive support and a photoconductive material capable of generating positive charge carriers when exposed to actinic radiation, the element having, situated between the support and the photoconductive material, an electrical barrier layer that restrains the injection of positive charge carriers from the conductive support, the barrier layer comprising a polyester ionomer. The method of the invention comprises coating on an electrically conductive support an aqueous dispersion of a polyester ionomer as a barrier layer, coating a charge generation layer over the barrier layer, and coating a p-type charge transport layer over the charge generation layer.

US Patent:

50324810, Jul 16, 1991

Filed:

Oct 30, 1989

Appl. No.:

7/429951

Inventors:

Martin A. Berwick - Kendall NY
William T. Gruenbaum - Rochester NY
Paul D. VanderValk - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G 514

US Classification:

430 60

Abstract:

An improved interlayer is provided for use in a photoconductor element between an electrically conductive layer and a charge generation layer of the type where a dye is aggregated in a matrix polymer. The interlayer is a mixture of at least one polyester and at least one polycarbonate. The interlayer provides excellent adhesion between the conductive layer and the charge generation layer and dampens any stress to which the photoconductive element is subjected. Minimal effect on photosensitivity is achieved by optimizing interlayer thickness.

US Patent:

44952635, Jan 22, 1985

Filed:

Jun 30, 1983

Appl. No.:

6/509535

Inventors:

Paul D. VanderValk - Rochester NY

Assignee:

Eastman Kodak Company - Rochester NY

International Classification:

G03G 514

US Classification:

430 60

Abstract:

Electrophotographic elements are disclosed containing an photoconductor layer overlying, in sequence, an electrically conducting layer, a polyamide interlayer and a support. In preferred embodiments, the element additionally comprises an integral screen layer between the support and the polyamide interlayer.

US Patent:

T149046, Dec 4, 1984

Filed:

Mar 2, 1984

Appl. No.:

6/585645

Inventors:

Paul D. VanderValk - Rochester NY

International Classification:

G03G 1322
G03G 514

US Classification:

430 31

Abstract:

A method of forming electrostatic images on a photoconductive element is disclosed. The method entails imagewise-exposing the photoconductive layer in the element to actinic radiation passing in sequence through an integral screen and a transparent support spacing the screen from the photoconductive layer in the element.