Patent US3158443A successfully refreshed from Google Patents.
US3158443A
Expired / Lapsed
US
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Production of tellurium
Assignee: LA LES PRODUITS SEMI-CONDUCTEURS Ste
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Filing: 1961-04-10
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Granted: 1964-11-24
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Expires: 1981-04-10
Abstract
No abstract record available.
Inventors
- 👤 Champ Roger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:10
CPC Classifications
C; C01; C01B; C01B19/00; C01B19/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN THE MANUFACTURE OF TELLURIUM HAVING NO MORE THAN ABOUT ONE PART PER MILLION OF EACH INPURITY, PARTICULARLY OF SELENIUM, THE PROCESS OF SUBLIMATION WHICH COMPRISES PREPARING TELLURIUM OF HIGH PURITY CONTAINING SUBSTANTIALLY MORE THAN ONE PART PER MILLION OF AT LEAST ONE METALLIC IMPURITY, HEATING THE TELLURIUM UNDER VACUUM OF THE ORDER OF 10**-3 MM. HG ABSOLUTE TO A TEMPERATURE OF ABOUT 400-500*C., ISOLATING THE FIRST FRACTION UNTIL 5-10% OF THE TELLURIUM HAS BEEN REMOVED, ISOLATING THE RESIDUE RAISING THE PRESSURE OVER THE RESIDUE TO THE ORDER OF SEVERAL MM. HG AND SUBLIMING THE RESIDUE AT ABOUT 650*C., AND ISOLATING THE EXTRA PURE TELLURIUM.
Claim 2
Dependent Claim
105 words
IN THE MANUFACTURE OF TELLURIUM HAVING NO MORE THAN ABOUT ONE PART PER MILLION OF EACH INPURITY, PARTICULARLY OF SELENIUM, THE PROCESS OF SUBLIMATION WHICH COMPRISES PREPARING TELLURIUM OF HIGH PURITY CONTAINING SUBSTANTIALLY MORE THAN ONE PART PER MILLION OF AT LEAST ONE METALLIC IMPURITY, HEATING THE TELLURIUM UNDER VACUUM OF THE ORDER OF 10**-3 MM. HG ABSOLUTE TO A TEMPERATURE OF ABOUT 400-500*C., ISOLATING THE FIRST FRACTION UNTIL 5-10% OF THE TELLURIUM HAS BEEN REMOVED, ISOLATING THE RESIDUE RAISING THE PRESSURE OVER THE RESIDUE TO THE ORDER OF SEVERAL MM. HG AND SUBLIMING THE RESIDUE AT ABOUT 650*C., AND ISOLATING THE EXTRA PURE TELLURIUM.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-11-24 | 1968-05-25 | 1968-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-11-24 | 1972-05-25 | 1972-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-11-24 | 1976-05-25 | 1976-11-24 | $7700.00 | Window Closed / Lapsed |