US3806771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Smoothly beveled semiconductor device with thick glass passivant
Assignee: General Electric Co
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Filing: 1971-01-15
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Granted: 1974-04-23
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Expires: 1991-01-15
Abstract
Abstract A silicon crystal having a major surface in the 100 crystallographic plane is etched with an alcoholic solution of potassium hydroxide to produce a smoothly tapered groove intersecting a junction at a positive bevel angle of about 55 degrees. To passivate the junction and to structurally reinforce the crystal a thick glass bonding layer is applied to the groove having a thermal coefficient of expansion no greater than that of silicon.
Inventors
- 👤 J Petruzella
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:32
CPC Classifications
H; H10; H10W; H10W74/00; H10W74/40; H10W74/43; H10D; H10D62/00; H10D62/10; H10D62/102; H10D62/103; H10D62/104; H10D99/00; H10P; H10P14/00; H10P14/60; H10P95/00; H10W40/00; H10W40/20; H10W40/25; H10W40/259; H10W74/10; H10W74/131; H10W74/134; H10W74/137; H10W72/00; H10W72/50; H10W72/541; H10W72/5449; H10W90/00; H10W90/701; H10W90/751; H10W90/756; Y; Y10; Y10S; Y10S148/00; Y10S148/028; Y10S148/051; Y10S148/085; Y10S148/115
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
The combination according to claim 1 in which the second major surface of each said crystal means is comprised of a metal contact layer overlying both the peripheral and central portions of said crystal means.
Claim 2
Dependent Claim
54 words
The combination according to claim 1 in which said thick glass passivating bonding layer is formed of an essentially alkali-free lead borosilicate glass comprised of, on a weight basis, from 60 to 80 per cent silicon dioxide, from 15 to 30 per cent boron oxide, and from 5 to 15 per cent lead oxide.
References Cited (Backward Citations)
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US3492174A
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US3493820A
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US3460003A
Cited
US3535133A
Cited
US3697829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-22 | 1977-10-22 | 1978-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-22 | 1981-10-22 | 1982-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-22 | 1985-10-22 | 1986-04-23 | $7700.00 | Window Closed / Lapsed |