US2944885A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of purifying arsenic and antimony
Assignee: Individual
•
Filing: 1959-06-02
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Granted: 1960-07-12
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Expires: 1979-06-02
Abstract
No abstract record available.
Inventors
- 👤 Guenter A Wolff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:49
CPC Classifications
C; C22; C22B; C22B30/00; C22B30/04; B; B01; B01D; B01D7/00; C01; C01G; C01G28/00; C01G28/005; C01G30/00; C01G30/004; C01G30/005; C22B30/02; C22B9/00; C22B9/02; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A FRACTIONAL SULBLIMATION PROCESS FOR REMOVING THE ELEMENTS OF THE SULFUR SELENIUM AND TELLURIUM FROM A METAL OF THE GROUP CONSISTING OF ARSENIC AND ANTIMONY COMPRISING HEATING THE OXIDES OF SAID METALS IN THE CLOSED END OF A TUBE UNDER HIGH VACUUM TO AT LEAST THEIR SUBLIMATION TEMPERATURES, ALLOWING THE METAL OXIDE VAPORS TO FRACTIONALLY CONDENSE ALONG A PROLONGED PATH OF DECREASING TEMPERATURES WITHIN THE EVACUATED TUBE TO FORM ZONES OF METAL OXIDE CRYSTALS OF DIFFERENT DEGREES OF PURITY, SAID ZONES BEING IDENTIFIABLE BY DIFFERENT DEGREES OF DISCOLORATION, MARKING THE EXTENT OF THE CENTRAL WHITE ZONE OF PUREST OXIDE CRYSTALS ON AN INDEX BAR EX-
Claim 2
Dependent Claim
105 words
A FRACTIONAL SULBLIMATION PROCESS FOR REMOVING THE ELEMENTS OF THE SULFUR SELENIUM AND TELLURIUM FROM A METAL OF THE GROUP CONSISTING OF ARSENIC AND ANTIMONY COMPRISING HEATING THE OXIDES OF SAID METALS IN THE CLOSED END OF A TUBE UNDER HIGH VACUUM TO AT LEAST THEIR SUBLIMATION TEMPERATURES, ALLOWING THE METAL OXIDE VAPORS TO FRACTIONALLY CONDENSE ALONG A PROLONGED PATH OF DECREASING TEMPERATURES WITHIN THE EVACUATED TUBE TO FORM ZONES OF METAL OXIDE CRYSTALS OF DIFFERENT DEGREES OF PURITY, SAID ZONES BEING IDENTIFIABLE BY DIFFERENT DEGREES OF DISCOLORATION, MARKING THE EXTENT OF THE CENTRAL WHITE ZONE OF PUREST OXIDE CRYSTALS ON AN INDEX BAR EX-
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) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |