Patent US3209218A successfully refreshed from Google Patents.
US3209218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicon semiconductor device
Assignee: Robert Bosch GmbH
•
Filing: 1961-02-23
•
Granted: 1965-09-28
•
Expires: 1981-02-23
Abstract
No abstract record available.
Inventors
- 👤 Zielasek Gotthold
- 👤 Uhlig Hildegard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:28
CPC Classifications
H; H10; H10P; H10P95/00; B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3006; C; C22; C22C; C22C5/00; C22C5/06; C22C5/08; H10D; H10D99/00; H10W; H10W40/00; H10W40/20; H10W40/22; H10W40/226
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A SEMICONDUCTOR DEVICE COMPRISING A THIN LAYER OF MONO-CRYSTALLINE SILICON, A METALLIC LAYER FORMING A CONTACT MEMBER OF HIGHLY HEAT CONDUCTING MATERIAL AND HAVING A COEFFICIENT OF THERMAL EXPANSION EQUAL TO THAT OF SILICON, AND A SOLDERING LAYER JOINING SAID METALLIC LAYER IN LOW-OHMIC CONTACT TO ONE SURFACE OF SAID SILICON LAYER, SAID SOLDERING LAYER HAVING A THICKNESS OF FROM 20% TO 40% OF THE THICKNESS OF SAID SILICON LAYER AND CONSISTING OF AN ALLOY COMPOSED OF 65% TO 75% AS TO WEIGHT OF SILVER, 20% TO 30% AS TO WEIGHT OF COPPER, AND 1% TO 10% AS TO WEIGHT OF TIN.
Claim 2
Dependent Claim
102 words
A SEMICONDUCTOR DEVICE COMPRISING A THIN LAYER OF MONO-CRYSTALLINE SILICON, A METALLIC LAYER FORMING A CONTACT MEMBER OF HIGHLY HEAT CONDUCTING MATERIAL AND HAVING A COEFFICIENT OF THERMAL EXPANSION EQUAL TO THAT OF SILICON, AND A SOLDERING LAYER JOINING SAID METALLIC LAYER IN LOW-OHMIC CONTACT TO ONE SURFACE OF SAID SILICON LAYER, SAID SOLDERING LAYER HAVING A THICKNESS OF FROM 20% TO 40% OF THE THICKNESS OF SAID SILICON LAYER AND CONSISTING OF AN ALLOY COMPOSED OF 65% TO 75% AS TO WEIGHT OF SILVER, 20% TO 30% AS TO WEIGHT OF COPPER, AND 1% TO 10% AS TO WEIGHT OF TIN.
References Cited (Backward Citations)
US2763822A
Cited
US2853661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |