Patent EP0537548A1 successfully refreshed from Google Patents.
US5229213A
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US
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Aluminum nitride circuit board
Assignee: Shinko Electric Industries Co Ltd
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Filing: 1989-11-13
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Granted: 1993-07-20
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Expires: 2009-11-13
Abstract
Abstract An aluminum nitride circuit board included an aluminum nitride ceramic as an insulating material and a conductor circuit which is formed at least as an inner conductor and is made of at least one of gold, copper or silver.
Inventors
- 👤 Michio Horiuchi
- 👤 Yoichi Harayama
- 👤 Yukiharu Takeuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:46
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/01; H10W70/05; H10W70/098; H10W70/60; H10W70/62; H10W70/63; H10W70/635; H10W70/67; H10W70/69; H10W70/692; H10W70/68; H10W70/682; H10W72/00; H10W72/50; H10W72/551; H10W72/552; H10W90/00; H10W90/701; H10W90/751; H10W90/754; Y; Y10; Y10S; Y10S428/00; Y10S428/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A circuit board comprising: a first green sheet containing aluminum nitride power and a sintering agent; a conductor circuit made of at least one of gold, copper and silver printed on a surface of the green sheet; and a second green sheet containing aluminum nitride power stacked on the surface of the first green sheet which includes the conductor circuit, said first and second green sheets and said conductor circuit being heat treated sufficiently to form a laminated structure, said laminated structure being fired to form a sintered body containing the conductor circuit therein.
Claim 2
Dependent Claim
94 words
A circuit board comprising: a first green sheet containing aluminum nitride power and a sintering agent; a conductor circuit made of at least one of gold, copper and silver printed on a surface of the green sheet; and a second green sheet containing aluminum nitride power stacked on the surface of the first green sheet which includes the conductor circuit, said first and second green sheets and said conductor circuit being heat treated sufficiently to form a laminated structure, said laminated structure being fired to form a sintered body containing the conductor circuit therein.
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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) | 1996-07-19 | 1997-01-18 | 1997-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-19 | 2001-01-18 | 2001-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-19 | 2005-01-18 | 2005-07-20 | $7700.00 | Window Closed / Lapsed |