Patent US2937075A successfully refreshed from Google Patents.
US2937075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing pure indium phosphide
Assignee: RCA Corp
•
Filing: 1956-06-08
•
Granted: 1960-05-17
•
Expires: 1976-06-08
Abstract
No abstract record available.
Inventors
- 👤 Weiser Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:17
CPC Classifications
C; C01; C01B; C01B25/00; C01B25/06; Y; Y10; Y10S; Y10S117/00; Y10S117/906; Y10S148/00; Y10S148/074
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
161 words
A METHOD OF FURTHER PURIFYING RELATIVELY IMPURE INDIUM PHOSPHIDE WHICH HAS BEEN PREPARED BY VAPORIZING SEPARATE QUANTITIES OF INDIUM AND PHOSPHORUS, REACTING THE VAPORS TO PRODUCE SAID INDIUM PHOSPHIDE AND COOLING THE REACTION PRODUCT, SAID METHOD COMPRISING PROVIDING A QUANTITY OF SAID RELATIVELY IMPURE INDIUM PHOSPHIDE AT ONE END OF AN EVACUATED CONTAINER, PROVIDING AT THE OTHER END OF THE CONTAINER A QUANTITY OF RELATIVELY PURE INDIUM, HEATING SAID RELATIVELY IMPURE INDIUM PHOSPHIDE TOA TEMPERATURE SUFFICIENT TO CAUSE DECOMPOSITION THEREOF TO YIELD RELATIVELY PURE PHOSPHORUS VAPOR, REACTING AT LEAST SOME OF SAID RELATIVELY PURE PHOSPHORUS VAPOR WITH SAID RELATIVELY PURE INDIUM TO FORM A RELATIVELY PURER COMPOUND OF INDIUM PHOSPHIDE, MELTING SAID RELATIVELY PURER COMPOUND UNDER A VAPOR PRESSURE OF UNREACTED PHOSPHORUS, ESTABLISHING A TEMPERATURE GRADIENT IN SAID MOLTEN COMPOUND FROM ONE END TO THE OTHER, AND RECOVERING RELATIVELY PURE CRYSTALLINE INDIUM PHOSPHIDE BY SLOWLY FREEZING SUCCESSIVE PORTIONS OF SAID MOLTEN COMPOUND PROCEEDING FROM THE COLDEST TO THE HOTTEST PORTION THEREOF.
Claim 2
Independent Claim
161 words
A METHOD OF FURTHER PURIFYING RELATIVELY IMPURE INDIUM PHOSPHIDE WHICH HAS BEEN PREPARED BY VAPORIZING SEPARATE QUANTITIES OF INDIUM AND PHOSPHORUS, REACTING THE VAPORS TO PRODUCE SAID INDIUM PHOSPHIDE AND COOLING THE REACTION PRODUCT, SAID METHOD COMPRISING PROVIDING A QUANTITY OF SAID RELATIVELY IMPURE INDIUM PHOSPHIDE AT ONE END OF AN EVACUATED CONTAINER, PROVIDING AT THE OTHER END OF THE CONTAINER A QUANTITY OF RELATIVELY PURE INDIUM, HEATING SAID RELATIVELY IMPURE INDIUM PHOSPHIDE TOA TEMPERATURE SUFFICIENT TO CAUSE DECOMPOSITION THEREOF TO YIELD RELATIVELY PURE PHOSPHORUS VAPOR, REACTING AT LEAST SOME OF SAID RELATIVELY PURE PHOSPHORUS VAPOR WITH SAID RELATIVELY PURE INDIUM TO FORM A RELATIVELY PURER COMPOUND OF INDIUM PHOSPHIDE, MELTING SAID RELATIVELY PURER COMPOUND UNDER A VAPOR PRESSURE OF UNREACTED PHOSPHORUS, ESTABLISHING A TEMPERATURE GRADIENT IN SAID MOLTEN COMPOUND FROM ONE END TO THE OTHER, AND RECOVERING RELATIVELY PURE CRYSTALLINE INDIUM PHOSPHIDE BY SLOWLY FREEZING SUCCESSIVE PORTIONS OF SAID MOLTEN COMPOUND PROCEEDING FROM THE COLDEST TO THE HOTTEST PORTION THEREOF.
References Cited (Backward Citations)
US1893296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-17 | 1963-11-16 | 1964-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-17 | 1967-11-16 | 1968-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-17 | 1971-11-16 | 1972-05-17 | $7700.00 | Window Closed / Lapsed |