Production of silica "green" tape and co-fired silica substrates therefrom
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United States of America Patent
Stats
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Feb 28, 1995
Grant Date -
N/A
app pub date -
Jan 28, 1988
filing date -
Jan 28, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Production of silica 'green' tapes employed in fabrication of multilayer circuit boards, by mixing silica powder comprised of spherical substantially uniform particles ranging in size from 0.1 to 2 microns, e.g., 0.7 micron, with a liquid medium containing a vinyl acetate--acrylic copolymer emulsion as binder, polyethylene glycol as plasticizer and dispersant, and preferably also including a small amount of boron, in the form of boric acid or boric oxide. The resulting slip is cast on a substrate, such as a polyester tape and dried to produce a crack-free tape. The resulting silica ' green' tape is cut into individual tapes, a predetermined circuit pattern is screened onto each tape, preferably employing gold or copper conductors, and the polyester backing is removed from the tapes. The screened silica 'green' tapes are then collated and registered to form a stack of layers, and the layers are laminated under pressure and at elevated temperature into a monolithic unit. Such monolithic unit is then fired at a temperature of the order of about 1050.degree. C. into a multilayer circuit board formed of silica having a low dielectric constant and capable of operating efficiently at high frequencies.

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- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
CALIFORNIA STATE UNIVERSITY | LONG BEACH FOUNDATION 6300 STATE UNIVERSITY DRIVE SUITE 332 LONG BEACH CA 90815 |
International Classification(s)

- [Classification Symbol]
- [Patents Count]
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Sanchez, Lloyd E | Huntington Beach, CA | 2 | 28 |
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Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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