US2855334A
Expired / Lapsed
US
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Method of preparing semiconducting crystals having symmetrical junctions
Assignee: Sprague Electric Co
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Filing: 1955-08-17
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Granted: 1958-10-07
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Expires: 1975-08-17
Abstract
No abstract record available.
Inventors
- 👤 Lehovec Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:20
CPC Classifications
H; H01; H01J; H01J37/00; H01J37/30; H01J37/317; H10; H10D; H10D8/00; H10D8/01; H10P; H10P95/00; Y; Y10; Y10S; Y10S148/00; Y10S148/072; Y10S148/107
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
A METHOD FOR PREPARING A SEMICONDUCTING CRYSTALS OF AT LEAST THREE REGIONS HAVING DIFFERING ELECTRICAL CHARACTERISTICS, SAID METHOD INCLUDING THE STEPS OF MELTING A SURFACE PORTION OF A GERMANIUM CRYSTAL HAVING AN IMPURITY PRESENT WHICH DETERMINES THE CONDUCTIVITY OF SAID CRYSTAL, SOLIDIFYING A DISCRETE LAYER OF SAID MELT BY THE ADDITION OF SILICON, DOPING THE REMAINDER OF SAID MELT WITH AN IMPURITY
Claim 2
Independent Claim
62 words
A METHOD FOR PREPARING A SEMICONDUCTING CRYSTALS OF AT LEAST THREE REGIONS HAVING DIFFERING ELECTRICAL CHARACTERISTICS, SAID METHOD INCLUDING THE STEPS OF MELTING A SURFACE PORTION OF A GERMANIUM CRYSTAL HAVING AN IMPURITY PRESENT WHICH DETERMINES THE CONDUCTIVITY OF SAID CRYSTAL, SOLIDIFYING A DISCRETE LAYER OF SAID MELT BY THE ADDITION OF SILICON, DOPING THE REMAINDER OF SAID MELT WITH AN IMPURITY
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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |