US PATENT SUBCLASS 257 / 634
.~.~ Insulating coating of glass composition containing component to adjust melting or softening temperature (e.g., low melting point glass)

Current as of: June, 1999
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257 /   HD   ACTIVE SOLID-STATE DEVICES (E.G., TRANSISTORS, SOLID-STATE DIODES)

629  DF  WITH MEANS TO CONTROL SURFACE EFFECTS {4}
632  DF  .~ Insulating coating {8}
634.~.~ Insulating coating of glass composition containing component to adjust melting or softening temperature (e.g., low melting point glass)

DEFINITION

Classification: 257/634

Insulating coating of glass composition containing component

to adjust melting or softening temperature (e.g., low melting point glass):

(under subclass 632) Subject matter wherein the insulating coating comprises a glass composition containing a component to adjust the melting or softening temperature.

(1) Note. A commonly used additive to lower the melting point of silica (silicon dioxide) is phosphorous oxide, producing phosphosilicate glass.

(2) Note. Such layers are typically provided so that the device can be heated to the softening point of the glass to cause it to flow and smooth out sharp edges on the semiconductor surface that might adversely affect subsequently deposited layers. Hence, such a layer is often called a reflow glass layer.