Patent GB742501A successfully refreshed from Google Patents.
US2602763A
Expired / Lapsed
US
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Preparation of semiconductive materials for translating devices
Assignee: AT&T Inc
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Filing: 1948-12-29
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Granted: 1952-07-08
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Expires: 1968-12-29
Abstract
No abstract record available.
Inventors
- 👤 Jack H Seaff
- 👤 Henry C Theuerer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 00:43
CPC Classifications
C; C09; C09B; C09B31/00; C09B31/02; C09B31/025; H; H10; H10P; H10P95/00; Y; Y10; Y10S; Y10S117/00; Y10S117/90; Y10S117/906; Y10S438/00; Y10S438/909; Y10S438/914; Y10S438/919; Y10S438/925; Y10S438/934
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
THE METHOD OF PRODUCING GERMANIUM MATERIAL FOR SIGNAL TRANSLATING DEVICES WHICH COMPRSES HEATING A GERMANIUM ALLOY CONTAINING CONDUCITIVITY DETERMINING FACTORS, AT A SERIES OF TEMPERATURES OVER THE RANGE BETWEEN ABOUT 400* C. AND 900* C. AND MEASURING THE RESISTIVITY OF SAID ALLOY FOLLOWING HEATING AT EACH OF SAID TEMPERATURES, THEREBY TO DETERMINE THE BALANCE TEMPERATURE FOR WHICH THE ALLOY HAS THE HIGHEST RESISTIVITY, AND THEN FURTHER HEATING SAID ALLOY AT A SELECTED TEMPERATURE IN SAID RANGE AND COOLING TO NORMAL TEMPERATURE, TO MAKE THE ALLOY OF PRESCRIBED CONDUCTIVITY TYPE AND RESISTIVITY, SAID SELECTED TEMPERATURE BEING ABOUT 500* C. FOR MINIMUM RESISTIVITY N-TYPE MATERIAL, BETWEEN ABOUT 500* C. AND SAID BALANCE TEMPERTURE FOR N-TYPE MATERIAL OF INCREASINGLY HIGHER RESISTIVITY AND BETWEEN SAID BALANCE TEMPERATURE AND ABOUT 900* C. FOR P-TYPE MATERIAL OF INCREASINGLY LOWER RESISTIVITY, TO A MINIMUM AT ABOUT 900* C.
Claim 2
Independent Claim
141 words
THE METHOD OF PRODUCING GERMANIUM MATERIAL FOR SIGNAL TRANSLATING DEVICES WHICH COMPRSES HEATING A GERMANIUM ALLOY CONTAINING CONDUCITIVITY DETERMINING FACTORS, AT A SERIES OF TEMPERATURES OVER THE RANGE BETWEEN ABOUT 400* C. AND 900* C. AND MEASURING THE RESISTIVITY OF SAID ALLOY FOLLOWING HEATING AT EACH OF SAID TEMPERATURES, THEREBY TO DETERMINE THE BALANCE TEMPERATURE FOR WHICH THE ALLOY HAS THE HIGHEST RESISTIVITY, AND THEN FURTHER HEATING SAID ALLOY AT A SELECTED TEMPERATURE IN SAID RANGE AND COOLING TO NORMAL TEMPERATURE, TO MAKE THE ALLOY OF PRESCRIBED CONDUCTIVITY TYPE AND RESISTIVITY, SAID SELECTED TEMPERATURE BEING ABOUT 500* C. FOR MINIMUM RESISTIVITY N-TYPE MATERIAL, BETWEEN ABOUT 500* C. AND SAID BALANCE TEMPERTURE FOR N-TYPE MATERIAL OF INCREASINGLY HIGHER RESISTIVITY AND BETWEEN SAID BALANCE TEMPERATURE AND ABOUT 900* C. FOR P-TYPE MATERIAL OF INCREASINGLY LOWER RESISTIVITY, TO A MINIMUM AT ABOUT 900* C.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-08 | 1956-01-07 | 1956-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-08 | 1960-01-07 | 1960-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-08 | 1964-01-07 | 1964-07-08 | $7700.00 | Window Closed / Lapsed |