Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Surface tension
Patent
1994-11-29
1996-12-10
Williams, Hezron E.
Measuring and testing
Liquid analysis or analysis of the suspension of solids in a...
Surface tension
G01N 1302
Patent
active
055832857
ABSTRACT:
A method for detecting the presence of a coating material, particularly an organic solderability preservative, such as imidazole, on a copper substrate includes placing a test droplet on the surface of the substrate, forming an image of the droplet and measuring the contact angle between the wall of the droplet and the surface of the substrate.
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Hahn Mark H.
Patterson Mary L.
Larkin Daniel S.
Lucent Technologies - Inc.
Williams Hezron E.
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