EP0219254A1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Joined ceramic-metal composite
Assignee: Toshiba Corp
•
Filing: 1986-09-26
•
Granted: —
•
Expires: 2006-09-26
Abstract
Abstract A joined ceramic-metal composite having a copper sheet (2) directly joined to a ceramic substrate (1) is disclosed. This composite is characterized by having a plurality of parallel grooves (3) formed on the surface of the copper sheet (2) to be joined to the ceramic substrate (1 ). The products of this invention show substantially none of the defects such as blisters inflicated on the copper sheet (2) during the course of union by heating and, therefore, serve advantageously as ceramic circuit substrates for use in transistor modules, for example.
Inventors
- 👤 Kazuo Patent Division Matsumura
- 👤 Mitsuhiro Patent Division Nagata
- 👤 Tadashi Patent Division Tanaka
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 05:15
CPC Classifications
C; C04; C04B; C04B37/00; C04B37/02; C04B37/021; H; H05; H05K; H05K3/00; H05K3/38; H10; H10W; H10W70/00; H10W70/01; H10W70/04; H10W70/047; C04B2235/00; C04B2235/65; C04B2235/656; C04B2235/6565; C04B2235/658; C04B2235/6583; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/343; C04B2237/36; C04B2237/366; C04B2237/40; C04B2237/402; C04B2237/407; C04B2237/50; C04B2237/52; C04B2237/54; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1062; Y10T156/1064
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
47 words
A joined ceramic-metal composite having a copper sheet(2) directly joined to one or each of the opposite surface of a ceramic substrate(1), which joined ceramic-metal composite is characterized by having a groove(3) formed on the surface of said copper sheet(2) to be joined to said ceramic substrate(1).
Claim 2
Dependent Claim
47 words
A joined ceramic-metal composite having a copper sheet(2) directly joined to one or each of the opposite surface of a ceramic substrate(1), which joined ceramic-metal composite is characterized by having a groove(3) formed on the surface of said copper sheet(2) to be joined to said ceramic substrate(1).
Claim 3
Dependent Claim
17 words
A joined ceramic-metal composite according to claim 1, wherein said groove(3) is formed plurally and substantially parallelly.
Claim 4
Dependent Claim
53 words
A joined ceramic-metal composite according to claim 2, wherein said groove(3) has a width in the range of 0.01 to 3 mm, a pitch in the range of 1 to 25 mm, and a depth of not less than 0.01 mm and not more than 1/2 of the thickness of said copper sheet(2).
Claim 5
Dependent Claim
23 words
A joined ceramic-metal composite according to claim 1, wherein the warp in said ceramic substrate(1) is not more than 20 pm/ 50 mm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.