US2669533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making germanium hall plates
Assignee: General Electric Co
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Filing: 1951-01-03
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Granted: 1954-02-16
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Expires: 1971-01-03
Abstract
No abstract record available.
Inventors
- 👤 Jr William Crawford Dunlap
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:20
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
68 words
THE METHOD OF MAKING GERMANIUM HALL PLATES WHICH METHOD COMPRISES EXTRACTING A WAFER OF GERMANIUM NO GREATER THAN 0.060 INCH THICK FROM AN INGOT OF HIGHLY PURIFIED GERMANIUM, HEATING THE WAFER FOR AN EXTENDED PERIOD OF TIME AT A TEMPERATURE ABOVE 600 DEGREES CENTIGRADE BUT BELOW THE MELTING POINT OF GERMANIUM, AND RAPIDLY COOLING THE HEATED WAFER AT A COOLING RATE OF AT LEAST 200 DEGREES PER SECOND.
Claim 2
Independent Claim
68 words
THE METHOD OF MAKING GERMANIUM HALL PLATES WHICH METHOD COMPRISES EXTRACTING A WAFER OF GERMANIUM NO GREATER THAN 0.060 INCH THICK FROM AN INGOT OF HIGHLY PURIFIED GERMANIUM, HEATING THE WAFER FOR AN EXTENDED PERIOD OF TIME AT A TEMPERATURE ABOVE 600 DEGREES CENTIGRADE BUT BELOW THE MELTING POINT OF GERMANIUM, AND RAPIDLY COOLING THE HEATED WAFER AT A COOLING RATE OF AT LEAST 200 DEGREES PER SECOND.
References Cited (Backward Citations)
GB632980A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-15 | 1957-08-17 | 1958-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-15 | 1961-08-17 | 1962-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-15 | 1965-08-17 | 1966-02-16 | $7700.00 | Window Closed / Lapsed |