US4678759A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ZrB2 composite sintered material
Assignee: AGC Inc
•
Filing: 1986-10-07
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Granted: 1987-07-07
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Expires: 2006-10-07
Abstract
Abstract A ZrB 2 composite sintered material consisting essentially of at least 1% by weight of SiC, at least 1% by weight of BN, at most 20% by weight of AlN, at most 20% by weight of B 4 C, the rest being substantially ZrB 2 , provided that the total amount of SiC and BN is from 2 to 50% by weight.
Inventors
- 👤 Otojiro Kida
- 👤 Yutaka Segawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/515; C04B35/58; C04B35/5805; C04B35/58064; C04B35/58078
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
51 words
A ZrB 2 composite sintered material consisting essentially of (a.) from 1 to 12% by weight of SiC, (b.) from 1 to 49% by weight of BN, the rest (c.) being substantially ZrB 2 , provided that the total amount of SiC and BN is from 2 to 50% by weight.
Claim 2
Dependent Claim
51 words
A ZrB 2 composite sintered material consisting essentially of (a.) from 1 to 12% by weight of SiC, (b.) from 1 to 49% by weight of BN, the rest (c.) being substantially ZrB 2 , provided that the total amount of SiC and BN is from 2 to 50% by weight.
Claim 3
Dependent Claim
16 words
The sintered material according to claim 1, wherein SiC is from 3 to 12% by weight.
Claim 4
Dependent Claim
22 words
The sintered material according to claim 1, wherein the total amount of SiC and BN is from 5 to 45% by weight.
Claim 5
Dependent Claim
33 words
The sintered material according to claim 1, wherein in the total amount of SiC and BN, SiC constitutes from 5 to 50% by weight, and BN constitutes from 95 to 50% by weight.
Claim 6
Dependent Claim
16 words
The sintered material according to claim 1, wherein BN is from 3 to 25% by weight.
Claim 7
Dependent Claim
21 words
The sintered material according to claim 1 wherein the grain size of crystals of ZrB 2 is at most 10 μm.
References Cited (Backward Citations)
US2872327A
Cited
US3189477A
Cited
GB954272A
Cited
US3325300A
Cited
US3775137A
Cited
US4029000A
Cited
US4233077A
Cited
GB2015498A
Cited
GB2021642A
Cited
US4199480A
Cited
US4379852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-07-06 | 1991-01-05 | 1991-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-07-06 | 1995-01-05 | 1995-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-07-06 | 1999-01-05 | 1999-07-07 | $7700.00 | Window Closed / Lapsed |