US2885364A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating semiconducting materials for electrical devices
Assignee: CBS Broadcasting Inc
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Filing: 1955-05-31
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Granted: 1959-05-05
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Expires: 1975-05-31
Abstract
No abstract record available.
Inventors
- 👤 Allen I Swartz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:48
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/02; H; H10; H10P; H10P95/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
THE PROCESS OF PURIFYING PARTIALLY REFINED SILICON FOR USE IN A SIMICONDUCTOR DEVICE AND SIMULTANEOUSLY ADJUSTING THE ELECTRICAL CHARACTERISTICS THEREOF WHICH COMPRISES THE STEPS OF ADDING APPROXIMATELY 5% ALUMINUM, BY WEIGHT, TO SAID PARTIALLY REFINED SILICON, MELTING SAID ALUMINUM AND SAID SILICON TOGETHER IN AN INERT ATMOSPHERE, COOLING SAID SILICON AND SAID ALUMINUM TO FORM A COMPOSITE SOLID HAVING A FIRST FRACTION OF SAID ALUMINUM IN SOLUTION WITH SAID SILICON AND THE REMAINDER OF SAID ALUMINUM CONCENTRATED AT THE GRAIN BOUNDARIES OF SAID SILICON AND AGGREGATED WITH IMPURITIES FROM SAID SILICON, COMMINUTING SAID COMPOSITE SOLID TO EXPOSE SUBSTANTIALLY EVERY GRAIN BOUNDARY THEREOF, AND ETCHING AWAY THE MATERIAL ADJACENT SAID GRAIN BOUNDARIES.
Claim 2
Dependent Claim
111 words
THE PROCESS OF PURIFYING PARTIALLY REFINED SILICON FOR USE IN A SIMICONDUCTOR DEVICE AND SIMULTANEOUSLY ADJUSTING THE ELECTRICAL CHARACTERISTICS THEREOF WHICH COMPRISES THE STEPS OF ADDING APPROXIMATELY 5% ALUMINUM, BY WEIGHT, TO SAID PARTIALLY REFINED SILICON, MELTING SAID ALUMINUM AND SAID SILICON TOGETHER IN AN INERT ATMOSPHERE, COOLING SAID SILICON AND SAID ALUMINUM TO FORM A COMPOSITE SOLID HAVING A FIRST FRACTION OF SAID ALUMINUM IN SOLUTION WITH SAID SILICON AND THE REMAINDER OF SAID ALUMINUM CONCENTRATED AT THE GRAIN BOUNDARIES OF SAID SILICON AND AGGREGATED WITH IMPURITIES FROM SAID SILICON, COMMINUTING SAID COMPOSITE SOLID TO EXPOSE SUBSTANTIALLY EVERY GRAIN BOUNDARY THEREOF, AND ETCHING AWAY THE MATERIAL ADJACENT SAID GRAIN BOUNDARIES.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |