US4672046A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sintered aluminum nitride body
Assignee: TDK Corp
•
Filing: 1986-06-17
•
Granted: 1987-06-09
•
Expires: 2006-06-17
Abstract
Abstract A sintered aluminum nitride body is produced by adding to aluminum nitride powder at least one sintering aid selected from the nitrides and hydrides of calcium, strontium and barium and mixtures thereof in an amount of 0.01 to 10% by weight of the aluminum nitride, molding the mixture, and sintering in a non-oxidizing atmosphere.
Inventors
- 👤 Kentaro Sawamura
- 👤 Yoshio Kosaka
- 👤 Masayasu Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 02:37
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
33 words
A sintered aluminum nitride body prepared by sintering aluminum nitride in admixture with a sintering aid selected from the group consisting of nitrides and hydrides of calcium, strontium and barium, and mixtures thereof.
Claim 2
Dependent Claim
33 words
A sintered aluminum nitride body prepared by sintering aluminum nitride in admixture with a sintering aid selected from the group consisting of nitrides and hydrides of calcium, strontium and barium, and mixtures thereof.
Claim 3
Dependent Claim
43 words
A sintered aluminum nitride body according to claim 1 wherein the aluminum nitride and the sintering aid are mixed both in the form of powder, and the sintering aid is added in amounts of 0.01 to 10% by weight of the aluminum nitride.
Claim 4
Dependent Claim
19 words
A sintered aluminum nitride body according to claim 1 wherein the aluminum nitride is sintered in a non-oxidizing atmosphere.
Claim 5
Dependent Claim
19 words
A sintered aluminum nitride body according to claim 1 further having a thermal conductivity of at least 80 W/m·K.
Claim 6
Dependent Claim
18 words
A sintered aluminum nitride body according to claim 1 further having a relative density of at least 90%.
Claim 7
Dependent Claim
20 words
A sintered aluminum nitride body according to claim 1 further having a volume resistivity of at least 10 12 Ωcm.
References Cited (Backward Citations)
US4435513A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-06-08 | 1990-12-08 | 1991-06-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-08 | 1994-12-08 | 1995-06-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-08 | 1998-12-08 | 1999-06-09 | $7700.00 | Window Closed / Lapsed |