Mark R Armstrong

US Patent:

6824929, Nov 30, 2004

Filed:

May 1, 2002

Appl. No.:

10/137055

Inventors:

Arthur John Taggi - Hockessin DE
Mark Leaman Armstrong - Wilmington DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

G03H 104

US Classification:

430 1, 430 2, 359 12, 359 35

Abstract:

A method is disclosed for replicating (copying) a master hologram into a photosensitive layer to produce a copy of the hologram in a manner such that the copy of the hologram is an accurate and true replication of the master hologram with minimum interface-related defects. A holographic element containing a master hologram for use in contact copying is also disclosed.

US Patent:

8492073, Jul 23, 2013

Filed:

Sep 11, 2008

Appl. No.:

12/283341

Inventors:

Mark L. Armstrong - Wilmington DE, US
Hao Chang - Lansdale PA, US

Assignee:

E I Du Pont de Nemours and Company - Wilmington DE

International Classification:

G03F 7/00
G03F 7/26

US Classification:

430306

Abstract:

The present invention provides a method and apparatus for forming a printing form from a photosensitive element to form a relief pattern. The method and apparatus thermally develop the photosensitive element by heating a composition layer of the element to cause a portion of the layer to liquefy and providing a development medium to the element to remove the liquefied composition. A conformable layer is disposed between the photosensitive element and a base support, which improves the compressibility and the contact between the photosensitive element and the development medium. The method and apparatus improve the efficiency of the removal of liquefied portions from the photosensitive element and the uniformity of the relief pattern formed.

US Patent:

20070246066, Oct 25, 2007

Filed:

Apr 21, 2006

Appl. No.:

11/409403

Inventors:

Hao Chang - Lansdale PA, US
Mark Armstrong - Wilmington DE, US

International Classification:

B08B 7/00

US Classification:

134006000

Abstract:

This invention pertains to a method for cleaning an automatic process device. The device is an apparatus for thermally treating a photosensitive element to form a relief surface. One or more contactable surfaces in the device can become contaminated with residue or other materials deposited from the photosensitive element during thermal treating and/or foreign bodies from ambient environment. A cleaning element having an adhesive layer on a support removes or reduces the level of contaminants on the contactable surface. The method includes passing the cleaning element through the device so that the adhesive layer contacts the contactable surfaces and thereby transfers at least one of the contaminants to the adhesive layer.

US Patent:

49592831, Sep 25, 1990

Filed:

Jul 14, 1989

Appl. No.:

7/380933

Inventors:

William K. Smothers - Hockessin DE
Krishna C. Doraiswamy - Wilmington DE
Mark L. Armstrong - Wilmington DE
Torence J. Trout - Yorklyn DE

Assignee:

E. I. du Pont de Nemours and Company - Wilmington DE

International Classification:

G02H 104
G02H 106

US Classification:

430 1

Abstract:

Wavelength response of volume holograms is altered by contact with a dry film diffusion element.

US Patent:

49956850, Feb 26, 1991

Filed:

May 16, 1989

Appl. No.:

7/352505

Inventors:

Mark L. Armstrong - Wilmington DE
Daniel J. Mickish - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

G03H 102

US Classification:

350 365

Abstract:

The invention relates to a method and system for making reflection holograms and, more specifically, for making reflection holograms from a cylindrical surface of a master. Means are provided to direct substantially monochromatic actinic radiation through a recording medium sensitive to such radiation coupled to the cylindrical surface of the master such that the angle of incidence of the radiation on the master is substantially constant.

US Patent:

50249096, Jun 18, 1991

Filed:

Jun 12, 1990

Appl. No.:

7/536792

Inventors:

William K. Smothers - Hockessin DE
Krishna C. Doraiswamy - Wilmington DE
Mark L. Armstrong - Wilmington DE

Assignee:

E. I. Du Pont de Nemours and Company - Wilmington DE

International Classification:

G03H 104
G03H 106

US Classification:

430 1

Abstract:

Wavelength response of volume holograms is altered by contact with a dry film diffusion element.