US3174823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing crystals of zn, cd and pb sulfides, selenides and tellurides
Assignee: Individual
•
Filing: 1961-12-15
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Granted: 1965-03-23
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Expires: 1981-12-15
Abstract
No abstract record available.
Inventors
- 👤 Kopelman Bernard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:17
CPC Classifications
C; C30; C30B; C30B9/00; C30B9/04; C30B9/08; C30B9/12; C30B29/00; C30B29/10; C30B29/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PROCESS FOR PREPARING USEFUL CRYSTALS SELECTED FROM THE CLASS CONSISTING OF ZINC, CADMIUM AND LEAD SULFIDES, SELENIDES AND TELLURIDES WHICH COMPRISES (1) DISSOLVING AT LEAST ONE SAID COMPOUND WHICH IS IN A NON-CRYSTALLINE FORM IN A MOLTEN SOLVENT SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL POLYSULFIDES, ALKALI METAL POLYSELENIDES, ALKALI METAL POLYTELLURIDES, AND MIXTURES OF THESE, (2) HEATING THE RESULTANT SOLUTION TO DRIVE OFF VOLATILES SELECTED FROM THE GROUP CONSISTING OF ELEMENTAL SULFUR, SELENIUM, TELLURIUM AND MIXTURES OF THESE, WHEREBY SAID ALKALI METAL POLYSULFIDES, POLYTELLURIDES AND POLYSELENIDES ARE CONVERTED TO THE CORRESPONDING ALKALI METAL SULFIDES, TELLURIDES AND SELENIDES AND (3) LEACHING THE RESULTING MIXTURE WITH WATER TO REMOVE THE WATER SOLUBLE MATERIALS ESSENTIALLY OF THE GROUP CONSISTING OF ALKALI METAL SULFIDES, SELENIDES, TELLURIDES AND MIXTURES OF THESE, LEAVING A RESIDUE OF SAID USEFUL CRYSTALS.
Claim 2
Dependent Claim
136 words
A PROCESS FOR PREPARING USEFUL CRYSTALS SELECTED FROM THE CLASS CONSISTING OF ZINC, CADMIUM AND LEAD SULFIDES, SELENIDES AND TELLURIDES WHICH COMPRISES (1) DISSOLVING AT LEAST ONE SAID COMPOUND WHICH IS IN A NON-CRYSTALLINE FORM IN A MOLTEN SOLVENT SELECTED FROM THE CLASS CONSISTING OF ALKALI METAL POLYSULFIDES, ALKALI METAL POLYSELENIDES, ALKALI METAL POLYTELLURIDES, AND MIXTURES OF THESE, (2) HEATING THE RESULTANT SOLUTION TO DRIVE OFF VOLATILES SELECTED FROM THE GROUP CONSISTING OF ELEMENTAL SULFUR, SELENIUM, TELLURIUM AND MIXTURES OF THESE, WHEREBY SAID ALKALI METAL POLYSULFIDES, POLYTELLURIDES AND POLYSELENIDES ARE CONVERTED TO THE CORRESPONDING ALKALI METAL SULFIDES, TELLURIDES AND SELENIDES AND (3) LEACHING THE RESULTING MIXTURE WITH WATER TO REMOVE THE WATER SOLUBLE MATERIALS ESSENTIALLY OF THE GROUP CONSISTING OF ALKALI METAL SULFIDES, SELENIDES, TELLURIDES AND MIXTURES OF THESE, LEAVING A RESIDUE OF SAID USEFUL CRYSTALS.
References Cited (Backward Citations)
US2957827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-22 | 1968-09-21 | 1969-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-22 | 1972-09-21 | 1973-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-22 | 1976-09-21 | 1977-03-23 | $7700.00 | Window Closed / Lapsed |