Inventor

Donald A. McGowan

Inventor

Bedford, MA, US

Overview

1982–2002

Patent span

Chemistry

Primary field (CPC C)

Patents· 15 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

C07Dprimary

C07DHeterocyclic compounds21%

B41MPrinting, duplicating, marking, or copying processes19%

C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments19%

Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests12%

G03CPhotosensitive materials for photographic purposes9%

G03GElectrography7%

G06KGraphical data reading7%

G11BInformation storage based on relative movement between record carrier and transducer7%

PatentTitleYear

6,482,950'Squarylium compounds, and processes and intermediates for the synthesis of these compounds'2002 5,919,950'Squarylium compounds, and processes and intermediates for the synthesis of these compounds'1999 5,795,981'Processes for the preparation of squarylium dyes'1998 5,492,795'Squarylium dyes, and processes and intermediates for the preparation thereof'1996 5,430,156'Color-providing compound having two or more cyclic 1,3 sulfur-nitrogen groups and two or more color-providing moieties'1995 5,415,970'Image-recording material'1995 5,354,873'Squarylium dyes, and processes and intermediates for the preparation thereof'1994 5,316,887'Thermally developable photosensitive material'1994 5,231,190'Squarylium compounds, and processes and intermediates for the synthesis of these compounds'1993 5,227,499'Substituted squarylium dyes, and processes and intermediates for the preparation thereof'1993 5,227,498'Squarylium dyes, and processes and intermediates for the preparation thereof'1993 4,826,976'Color-shifted dyes with thermally unstable carbamate moiety comprising T-alkoxycarbonyl group'1989 4,663,518'Optical storage identification card and read/write system'1987 4,602,263'Thermal imaging method'1986 4,355,169'Thiazolidinyl-substituted phenyl sulfonamides'1982

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1982–2002Patents assigned to POLAROID CORP (15)· patent assignee history

1982Based in Arlington, MA, US· patent location history

1986–1989Based in Stoneham, MA, US· patent location history

1993–2002Based in Bedford, MA, US· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
POLAROID CORP	15	1982–2002

Locations

Location	Patents	Span
Bedford, Massachusetts, US	11	1993–2002
Stoneham, Massachusetts, US	3	1986–1989
Arlington, Massachusetts, US	1	1982