US4814303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anorthite-cordierite based ceramics from zeolites
Assignee: EIDP Inc
•
Filing: 1987-09-25
•
Granted: 1989-03-21
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Expires: 2007-09-25
Abstract
Abstract Process for producing monolithic ceramic articles by sintering at temperatures from about 900° C. to about 1350° C. a shaped zeolite charge comprised of selected zeolites with Si/Al ratios of from about 0.7 to about 5.
Inventors
- 👤 Uma Chowdhry
- 👤 David R. Corbin
- 👤 Munirpallam A. Subramanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/44; H; H10; H10W; H10W99/00; C04B35/16; C04B35/18; C04B35/195; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/0306
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
86 words
A process for producing a monolithic ceramic article comprising sintering at a temperature from about 900° C. to about 1350° C. a shaped zeolite charge comprised of one or more zeolites having Si/Al atomic ratios from about 0.7 to about 3 selected from the group consisting of zeolites of the Ca-forms of zeolites X, Y, and A, the (Ca, Mg)-forms of zeolites X, Y, and A, and the Mg-forms of zeolites X, Y, and A, with the resulting ceramic article being anorthite, cordierite, or anorthite-cordierite based.
Claim 2
Dependent Claim
86 words
A process for producing a monolithic ceramic article comprising sintering at a temperature from about 900° C. to about 1350° C. a shaped zeolite charge comprised of one or more zeolites having Si/Al atomic ratios from about 0.7 to about 3 selected from the group consisting of zeolites of the Ca-forms of zeolites X, Y, and A, the (Ca, Mg)-forms of zeolites X, Y, and A, and the Mg-forms of zeolites X, Y, and A, with the resulting ceramic article being anorthite, cordierite, or anorthite-cordierite based.
Claim 3
Dependent Claim
30 words
A process according to claim 1 wherein the Si/Al ratio of the shaped zeolite charge is from about 1.1 to about 2.5, with the resulting ceramic being dense and hermetic.
Claim 4
Dependent Claim
23 words
A prpocess according to claim 2 wherein the Si/Al atomic ratio of the shaped zeolite charge is from about 1.1 to about 1.4.
Claim 5
Dependent Claim
126 words
A process for producing a monolithic, dense, hermetic ceramic article that is anorthite, cordierite, or anorthite-cordierite based and suitable for use as a substrate for electronic circuits comprising sintering at a temperature from about 950° C. to about 1350° C. a shaped zeolite charge comprised of one or more zeolites having Si/Al atomic ratios from about 0.7 to about 3 selected from the group consisting of the Ca-forms of zeolites X, Y, and A, the (Ca, Mg)-forms of zeolites X, Y, and A, and the Mg-forms of zeolites X, Y, and A, wherein the shaped zeolite charge has a Si/Al atomic ratio from about 1.1 to about 2.5, a Na/(Si+Al) atomic ratio less than about 0.08 and a (Ca+Mg)/(Si+Al) atomic ratio of at least about 0.11.
Claim 6
Dependent Claim
126 words
A process for producing a monolithic, dense, hermetic ceramic article that is anorthite, cordierite, or anorthite-cordierite based and suitable for use as a substrate for electronic circuits comprising sintering at a temperature from about 950° C. to about 1350° C. a shaped zeolite charge comprised of one or more zeolites having Si/Al atomic ratios from about 0.7 to about 3 selected from the group consisting of the Ca-forms of zeolites X, Y, and A, the (Ca, Mg)-forms of zeolites X, Y, and A, and the Mg-forms of zeolites X, Y, and A, wherein the shaped zeolite charge has a Si/Al atomic ratio from about 1.1 to about 2.5, a Na/(Si+Al) atomic ratio less than about 0.08 and a (Ca+Mg)/(Si+Al) atomic ratio of at least about 0.11.
Claim 7
Dependent Claim
23 words
A process according to claim 4 wherein the Si/Al atomic ratio of the shaped zeolite charge is from about 1.1 to about 1.4.
Claim 8
Dependent Claim
22 words
A process according to claims 4 or 5 wherein the Na/(Si+Al) ratio of the shaped zeolite charge is less than about 0.02.
Claim 9
Dependent Claim
18 words
A process according to claim 6 wherein the temperature is from about 950° C. to about 1050° C.
Claim 10
Dependent Claim
23 words
A process according to claims 1, 2, 3, 4 or 5 wherein the temperature is from about 0° C. to about 1050° C.
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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) | 1992-03-20 | 1992-09-19 | 1993-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-03-20 | 1996-09-19 | 1997-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-03-20 | 2000-09-19 | 2001-03-21 | $7700.00 | Window Closed / Lapsed |