International Business Machines Corporation

John A Trumpetto

Harry David Cox

Michael Stephen Vanca

Richard Michael Shroedl

Connie Fassett Littell

James N Humenik

Rao Venkateswara Vallabhaneni

Dinesh Gupta

John Joseph Garant

Hsichang Liu

Renee L Weisman

Jawahar P Nayak

Michael E Cropp

James C Utter

Paul G McLaughlin

Gerald H Leino

Jeffrey A Brody

Deborah Anne Sylvester

Charles Timothy Ryan

Ahmed Sayeed Shah

Chang-Ching Kin

James M Blazick

Frank V Ranalli

Donald R Cowell

Evelyn Barrington

Mark W Jones

Lorraine Di Piero-Simmonds

John J Nahlik

Edward J Hassdenteufel, Iii

Richard C Steger

A screening mask having a stress-relieving area including an inner functional area having a pattern which is replicated on an underlying substrate, the inner functional area pattern having an one open area through which a paste is extruded and at least one tab, and an outer nonfunctional area distinct from the inner functional area, the outer nonfunctional area having a stress-relieving area adjacent to an edge of the screening mask that protects the at least one tab in the inner functional area from breaking.

Screening mask having a stress-relieving area

A process of forming a multi-layer feature on a ceramic or organic article in which first and second layers of paste are sequentially screened through a screening mask wherein the screening mask has not been moved between screening steps. A structure produced by this process is also disclosed.

Single mask screening process

A mask for printing a pattern on a substrate comprises a sheet preferably of metal having a printing pattern thereon comprising through mask openings in the sheet. The through mask openings are interconnected by tabs or bridges which have a structure which provides a bending moment in a portion of the tab when a force is applied to the mask to force material to be deposited on the substrate through the mask openings. A preferred tab structure has a step shape and at least one through opening in the tab. The step shape and through mask opening both provide bending moments in the tab and the through opening also provides enhanced patterning definition because the deposition material flows both under the tab and through the through tab opening. The masks have a longer operating life than conventional masks and enhanced operating characteristics.

Flex tab thick film metal mask to deposit coating material

Flex tab thick film metal mask

An improved metal mask-making process is disclosed which involves starting with a metal mask having etched apertures using existing processes and coating it conformably with a substantially thick layer, so as to reduce the minimum aperture size while increasing the metal mask thickness. The conformal layer is chosen for minimum stress, good adhesion and thermal compatibility to the original metal mask material. Additional thin conformal coatings can be provided for imparting mechanical and chemical resistance to the metal mask.

High aspect ratio molybdenum composite mask method

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Hopewell Junction, NY, United States of America

John A Trumpetto