Patent US4484972A successfully refreshed from Google Patents.
US4484972A
Expired / Lapsed
US
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Method for adhesion of silicon nitride parts
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1982-08-12
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Granted: 1984-11-27
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Expires: 2002-08-12
Abstract
Abstract Adhesion of two silicon nitride parts is accomplished by interposing a layer of calcium fluoride or a mixture of calcium fluoride with kaoline between the two silicon nitride parts and heating the resultant interposed layer.
Inventors
- 👤 Yoshihiro Ebata
- 👤 Nobuyuki Tamari
- 👤 Makoto Kinoshita
- 👤 Yasuo Toibana
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:51
CPC Classifications
C; C09; C09J; C09J1/00; C04; C04B; C04B37/00; C04B37/003; C04B37/006; C04B2237/00; C04B2237/02; C04B2237/04; C04B2237/06; C04B2237/062; C04B2237/09; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/368; C04B2237/50; C04B2237/70; C04B2237/704
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
55 words
A method for the adhesion of two silicon nitride parts, said method comprising interposing a mixture of 99% to 50% by weight of calcium fluoride and 1% to 50% by weight of kaolin between the two silicon nitride parts and heating the mixture to a temperature not lower than the decomposition point of calcium fluoride.
Claim 2
Independent Claim
55 words
A method for the adhesion of two silicon nitride parts, said method comprising interposing a mixture of 99% to 50% by weight of calcium fluoride and 1% to 50% by weight of kaolin between the two silicon nitride parts and heating the mixture to a temperature not lower than the decomposition point of calcium fluoride.
Claim 3
Dependent Claim
15 words
The method as defined in claim 1, wherein the mixture is in a powdered form.
Claim 4
Dependent Claim
25 words
The method as defined in claim 1, wherein the mixture is in the form of paste obtained by mixing the mixture with a pasting agent.
Claim 5
Dependent Claim
32 words
The method as defined in claim 1, wherein the mixture is interposed between the two silicon nitride parts at a ratio of 0.01 to 0.2 grams per cm 2 of interfacial area.
Claim 6
Dependent Claim
32 words
The method as defined in claim 2, wherein the mixture is interposed between the two silicon nitride parts at a ratio of 0.01 to 0.2 grams per cm 2 of interfacial area.
Claim 7
Dependent Claim
32 words
The method as defined in claim 3, wherein the mixture is interposed between the two silicon nitride parts at a ratio of 0.01 to 0.2 grams per cm 2 of interfacial area.
Claim 8
Dependent Claim
24 words
The method as defined in claim 1, wherein the mixture is heated to a temperature in the range of 1200° C. to 1500° C.
Claim 9
Dependent Claim
24 words
The method as defined in claim 1, wherein the mixture is heated to a temperature in the range of 1400° C. to 1500° C.
References Cited (Backward Citations)
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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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |