Donald H Mccarthy

US Patent:

42307945, Oct 28, 1980

Filed:

Mar 16, 1979

Appl. No.:

6/021325

Inventors:

Donald C. McCarthy - Delran NJ

Assignee:

RCA Corporation - New York NY

International Classification:

G03C 500

US Classification:

430323

Abstract:

The etch resistance of a casein-based photoresist pattern to low specific gravity ferric chloride based etchant solutions is increased by treating the photoresist pattern with a formaldehyde solution containing at least 10 percent formaldehyde by volume by a period of at least 30 seconds, and thereafter drying the photoresist pattern.

US Patent:

41745310, Nov 13, 1979

Filed:

Nov 14, 1977

Appl. No.:

5/851401

Inventors:

Donald C. McCarthy - Delran NJ
Martin Rayl - Lawrenceville NJ

Assignee:

RCA Corporation - New York NY

International Classification:

H05K 104

US Classification:

361411

Abstract:

This invention pertains to increasing the arc track resistance of printed circuit boards by applying an acrylic resin to the printed circuit board wherein the acrylic resin is a polymer having the recurring unit: ##STR1## wherein x of each unit is independently selected from integers of 0 to 15 and each R. sub. 1, R. sub. 2, R. sub. 3, R. sub. 4 and R. sub. 5 is independently selected from the group consisting of H, --CH. sub. 3 and --C. sub. 2 H. sub. 5.