Polymer marker
First Claim
1. A method of making a semiconductor device situated within a package with conductive leads extending from the package, said method comprising the steps of:
- testing a plurality of said semiconductor devices so as to determine defective devices; and
marking said defective devices with a polymer marker able to withstand temperatures in excess of 200 C., acids with a pH of less than 2, and basic solutions with a pH of greater than 11.
1 Assignment
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Accused Products
Abstract
An embodiment of the instant invention is a method of making a semiconductor device situated within a package with conductive leads extending from the package, the method comprising the steps of: testing a plurality of the semiconductor devices so as to determine defective devices; and marking the defective devices with a polymer marker able to withstand temperatures in excess of 200 C., acids with a pH of less than 2, and basic solutions with a pH of greater than 11. Preferably, the polymer marker is comprised of a surfactant, a solvent, a polymer backbone, and a dye, and may additionally include an adhesion promoter. The surfactant is, preferably, comprised of: SVC-15, isopropanol, and any combination thereof. The solvent is, preferably, comprised of a substance consisting of: ENSOLV, bromopropane, chloropropane, and Cn H2n+1 X (where X is a halogen and n is between 3 and 5), and any combination thereof. Preferably, the polymer backbone is comprised of: PMMA and an acrylate with a molecular weight between 30 and 100,000 AMU/gram.
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Citations
14 Claims
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1. A method of making a semiconductor device situated within a package with conductive leads extending from the package, said method comprising the steps of:
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testing a plurality of said semiconductor devices so as to determine defective devices; and marking said defective devices with a polymer marker able to withstand temperatures in excess of 200 C., acids with a pH of less than 2, and basic solutions with a pH of greater than 11. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification