Richard Marc Cournoyer

US Patent:

44291426, Jan 31, 1984

Filed:

Jul 10, 1981

Appl. No.:

6/281981

Inventors:

Richard L. Cournoyer - Waltham MA
James W. Foley - Andover MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

C07D31182

US Classification:

549394

Abstract:

In one embodiment, the present invention is concerned with novel xanthene compounds selected from those of the formulae ##STR1## wherein each R. sup. 1 the same or different is alkyl, each R. sup. 2 the same or different is an electron-withdrawing group having a positive sigma value greater than 0. 6, X is ##STR2## wherein R. sup. 3 is alkyl, Y is an electron-withdrawing group, n is 0 or 1 and A is an anion. In another embodiment, the present invention is concerned with photographic products and processes employing these xanthene compounds, e. g. , as photographic light-screening dyes.

US Patent:

43048340, Dec 8, 1981

Filed:

Jul 17, 1980

Appl. No.:

6/169834

Inventors:

Richard L. Cournoyer - Waltham MA
James W. Foley - Andover MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

G03C 140
G03C 184
G03C 554
G03C 110

US Classification:

430221

Abstract:

In one embodiment, the present invention is concerned with novel xanthene compounds selected from those of the formulae ##STR1## wherein each R. sup. 1 the same or different is alkyl, each R. sup. 2 the same or different is an electron-withdrawing group having a positive sigma value greater than 0. 6, X is ##STR2## wherein R. sup. 3 is alkyl, Y is an electron-withdrawing group, n is 0 or 1 and A is an anion. In another embodiment, the present invention is concerned with photographic products and processes employing these xanthene compounds, e. g. , as photographic light-screening dyes.

US Patent:

42581192, Mar 24, 1981

Filed:

Dec 26, 1979

Appl. No.:

6/106938

Inventors:

Richard L. Cournoyer - Waltham MA
James W. Foley - Andover MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

G03C 140
G03C 184
G03C 554
G03C 148

US Classification:

430221

Abstract:

In one embodiment, the present invention is concerned with novel xanthene compounds of the formula ##STR1## wherein X is ##STR2## wherein R' is alkyl, Y is an electron-withdrawing group and n is 0 or 1. In another embodiment, the present invention is concerned with photographic products and processes employing these xanthene compounds.

US Patent:

51926458, Mar 9, 1993

Filed:

Jul 12, 1991

Appl. No.:

7/729420

Inventors:

Roger A. Boggs - Wayland MA
Alan L. Borror - Cape Elizabeth ME
Patrick R. Conlon - Wakefield MA
Richard L. Cournoyer - San Jose CA
Ernest W. Ellis - Leverett MA
David P. Waller - Lexington MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

G03C 172

US Classification:

430338

Abstract:

A thermal imaging method for forming color images is provided which employs as the color image-forming material, a colorless precursor of a preformed image dye possessing at least one thermal protecting group that undergoes fragmentation upon heating and at least one leaving group that undergoes irreversible elimination upon heating, said protecting and leaving groups maintaining the precursor in its colorless form until heat is applied to effect removal of these groups whereby the precursor is converted to an image dye.

US Patent:

53508700, Sep 27, 1994

Filed:

Apr 12, 1993

Appl. No.:

8/045133

Inventors:

Roger A. Boggs - Wayland MA
Richard L. Cournoyer - San Jose CA
Ernest W. Ellis - Leverett MA
Sandra E. Russo-Rodriguez - Englewood CO
Stephen J. Telfer - Arlington MA
David P. Waller - Lexington MA
Michael J. Zuraw - Arlington MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

C07C22926
C07C23720

US Classification:

560 27

Abstract:

Leuco dyes are provided which comprise the coupling product of a N-acyl substituted aromatic amino color developer and a dye-forming coupler moiety substituted at the coupling carbon with a thermally removable leaving group. Thermal imaging systems employing these leuco dyes have the advantage of reduced bubble formation relative to thermal imaging systems employing prior art leuco dyes containing a group which thermally fragments into one or more gases.

US Patent:

52368840, Aug 17, 1993

Filed:

May 6, 1991

Appl. No.:

7/696151

Inventors:

Roger A. Boggs - Wayland MA
Richard L. Cournoyer - San Jose CA
Ernest W. Ellis - Leverett MA
Sandra E. Russo-Rodriguez - Englewood CO
Stephen J. Telfer - Arlington MA
David P. Waller - Lexington MA
Michael J. Zuraw - Arlington MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

B41M 530

US Classification:

503201

Abstract:

Leuco dyes are provided which comprise the coupling product of a N-acyl substituted aromatic amino color developer and a dye-forming coupler moiety substituted at the coupling carbon with a thermally removable leaving group. Thermal imaging systems employing these leuco dyes have the advantage of reduced bubble formation relative to thermal imaging systems employing prior art leuco dyes containing a group which thermally fragments into one or more gases.

US Patent:

54244757, Jun 13, 1995

Filed:

Jul 12, 1991

Appl. No.:

7/729426

Inventors:

Roger A. Boggs - Wayland MA
Alan L. Borror - Cape Elizabeth ME
Patrick R. Conlon - Wakefield MA
Richard L. Cournoyer - San Jose CA
Ernest W. Ellis - Leverett MA
David P. Waller - Lexington MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

C07C27114
C07C27128

US Classification:

560 27

Abstract:

Colorless precursors of preformed image dyes are provided which are useful as the color image-forming materials in thermal imaging systems. These colorless precursors possess at least one thermal protecting group that undergoes fragmentation upon heating and at least one leaving group that undergoes irreversible elimination upon heating, said protecting and leaving groups maintaining the precursor in its colorless form until heat is applied to effect removal of these groups whereby the precursor is converted to an image dye.

US Patent:

42909503, Sep 22, 1981

Filed:

May 30, 1980

Appl. No.:

6/154618

Inventors:

Richard L. Cournoyer - Waltham MA
James W. Foley - Andover MA

Assignee:

Polaroid Corporation - Cambridge MA

International Classification:

C07D20908

US Classification:

26032612R

Abstract:

In one embodiment, the present invention is concerned with novel xanthene compounds of the formula ##STR1## wherein X is ##STR2## wherein R' is alkyl, Y is an electron-withdrawing group and n is 0 or 1. In another embodiment, the present invention is concerned with photographic products and processes employing these xanthene compounds.