Patent US4039338A successfully refreshed from Google Patents.
US4039338A
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Accelerated sintering for a green ceramic sheet
Assignee: International Business Machines Corp
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Filing: 1972-12-29
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Granted: 1977-08-02
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Expires: 1992-12-29
Abstract
Abstract A green ceramic sheet material adaptable for accelerated sintering comprising a high alumina ceramic green sheet having an average particle size greater than one micron with a close particle size distribution and being formed into a solid integrated circuit interconnection substrate by heating the ceramic green sheet directly to its sintering temperature, absent the binder burn-off step.
Inventors
- 👤 William R. Swiss
- 👤 Wayne S. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:41
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/63; C04B35/632; C04B35/634; C04B35/63404; C04B35/6342; C04B35/01; C04B35/10; C04B35/111; C04B35/64
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
75 words
A solvent-free flexible ceramic dried green sheet dispersion comprising: a. a plurality of ceramic particles having an average particle size represented by point 40 on the graph of FIG. 8 with 95% of said particles falling within 2 microns of said point, b. in combination with a glassy frit material, and c. a pyrolytically decomposable polymeric organic binder dispersed with said plurality of ceramic particles and said glassy frit material and occupying the interstices therebetween.
Claim 2
Dependent Claim
75 words
A solvent-free flexible ceramic dried green sheet dispersion comprising: a. a plurality of ceramic particles having an average particle size represented by point 40 on the graph of FIG. 8 with 95% of said particles falling within 2 microns of said point, b. in combination with a glassy frit material, and c. a pyrolytically decomposable polymeric organic binder dispersed with said plurality of ceramic particles and said glassy frit material and occupying the interstices therebetween.
Claim 3
Dependent Claim
25 words
A flexible ceramic dried green sheet dispersion as in claim 1 wherein: a. said ceramic particles comprises substantially pure alumina, Al 2 O 3 .
Claim 4
Dependent Claim
25 words
A flexible ceramic dried green sheet dispersion as in claim 1 wherein said frit has a particle size distribution essentially that of said ceramic particles.
Claim 5
Dependent Claim
25 words
A flexible ceramic dried green sheet dispersion as in claim 2 wherein said frit has a particle size distribution essentially that of said ceramic particles.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-01 | 1981-01-31 | 1981-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-01 | 1985-01-31 | 1985-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-01 | 1989-01-31 | 1989-08-02 | $7700.00 | Window Closed / Lapsed |