Patent JPS4927675A successfully refreshed from Google Patents.
US2887359A
Expired / Lapsed
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Method for preparing pentavalent arsenic selenides
Assignee: Individual
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Filing: 1954-11-08
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Granted: 1959-05-19
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Expires: 1974-11-08
Abstract
No abstract record available.
Inventors
- 👤 Francois F Gans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:14
CPC Classifications
C; C01; C01B; C01B19/00; C01B19/007; C01B19/002; C03; C03C; C03C3/00; C03C3/32; C03C3/321; C03C4/00; C03C4/10; C01P; C01P2002/00; C01P2002/80; C01P2002/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A PROCESS FOR MANUFACTURING INFRA-RED TRANSPARENT OPTICAL ELEMENTS FROM FUSED PENTAVALENT ARSENIC GLASS SELECTED FROM THE GROUP CONSISTING OF AS2SE5, AS2 SE3S2 AND AS2SE2S3 COMPRISING COMMINUTING SAID GLASS INTO FINELY DIVIDED FORM, DISSOLVING SAID FINELY DIVIDED GLASS IN AN AQUEOUS ALKALINE SOLUTION CONTAINING ALKALI SELECTED FROM THE GROUP CONSISTING OF AMMONIUM HYDROXIDE AND ALAKLI METAL HYDROXIDE ACIDIFYING THE AQUEOUS ALKALINE SOLUTION WITH MINERAL ACID TO FORM A PRECIPITATE, ISOLATING AND PURIFYING SAID PRECIPITATE BY WASHING WITH WATER TO REMOVE THE ACID AND OTHER WATER-SOLUBLE IMPURITITES FROM SAID PRECIPITATE, FUSING SAID PRECIPITATE IN AN INERT ATMOSPHERE AT A TEMPERATURE OF ABOUT 500* C. TO FORM A MOLTEN ARSENIC PENTASELENIDE GLASS, CASTING AND COOLING SAID GLASS AND FORMING AN OPTICAL ELEMENT THEREFROM WHICH EXHIBITS ENHANCED TRANSMISSION IN THE INFRA-RED REGION AS COMPARED WITH TRANSMISSION OF OPTICAL ELEMENTS PREPARED FROM THE STARTING FUSED PENTAVALENT ARSENIC GLASS.
Claim 2
Dependent Claim
143 words
A PROCESS FOR MANUFACTURING INFRA-RED TRANSPARENT OPTICAL ELEMENTS FROM FUSED PENTAVALENT ARSENIC GLASS SELECTED FROM THE GROUP CONSISTING OF AS2SE5, AS2 SE3S2 AND AS2SE2S3 COMPRISING COMMINUTING SAID GLASS INTO FINELY DIVIDED FORM, DISSOLVING SAID FINELY DIVIDED GLASS IN AN AQUEOUS ALKALINE SOLUTION CONTAINING ALKALI SELECTED FROM THE GROUP CONSISTING OF AMMONIUM HYDROXIDE AND ALAKLI METAL HYDROXIDE ACIDIFYING THE AQUEOUS ALKALINE SOLUTION WITH MINERAL ACID TO FORM A PRECIPITATE, ISOLATING AND PURIFYING SAID PRECIPITATE BY WASHING WITH WATER TO REMOVE THE ACID AND OTHER WATER-SOLUBLE IMPURITITES FROM SAID PRECIPITATE, FUSING SAID PRECIPITATE IN AN INERT ATMOSPHERE AT A TEMPERATURE OF ABOUT 500* C. TO FORM A MOLTEN ARSENIC PENTASELENIDE GLASS, CASTING AND COOLING SAID GLASS AND FORMING AN OPTICAL ELEMENT THEREFROM WHICH EXHIBITS ENHANCED TRANSMISSION IN THE INFRA-RED REGION AS COMPARED WITH TRANSMISSION OF OPTICAL ELEMENTS PREPARED FROM THE STARTING FUSED PENTAVALENT ARSENIC GLASS.
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) | 1962-05-18 | 1962-11-17 | 1963-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-18 | 1966-11-17 | 1967-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-18 | 1970-11-17 | 1971-05-19 | $7700.00 | Window Closed / Lapsed |