US3087799A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of cadmium sulfide crystals
Assignee: Eagle Picher Co
•
Filing: 1958-10-01
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Granted: 1963-04-30
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Expires: 1978-10-01
Abstract
No abstract record available.
Inventors
- 👤 Richard H Fahrig
- 👤 William E Medcalf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 16:25
CPC Classifications
C; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/46; C30B29/48; C30B29/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR PREPARING A LARGE SINGLE CRYSTAL OF CADMIUM SULFIDE, SAID PROCESS COMPRISING, DENSIFYING CADMIUM SULFIDE POWDER BY HEATING IT TO A TEMPERATURE OF SUBSTANTIALLY 900*C. IN A VACUUM, CRUSHING THE DENSIFIED CADMIUM SULFIDE, MELTING SAID DENSIFIED SULFIDE AT A PRESSURE OF AT LEAST 500 P.S.I. IN AN INERT GAS, AT A TEMPERATURE OF AT LEAST ABOUT 1500*C., SAID MELTING BEING EFFECTED RAPIDLY IN A PERIOD OF LESS THAN ABOUT TEN MINUTES SO THAT SUBLIMATION AND DISSOCIATION OF SAID SULFIDE ARE REDUCED, AND MAINTAINING THE MOLTEN SULFIDE UNDER A PRESSURE ABOVE ABOUT 500 P.S.I. WHILE COOLING THE MELT OVER A PERIOD OF AT LEAST ABOUT THREE HOURS, SAID COOLING BEING CONDUCTED IN SUCH MANNER THAT A SUBSTANTIALLY PLANAR SOLID-LIQUID INTERFACE MOVES PROGRESSIVELY THROUGH THE MELT IN A SINGLE DIRECTION.
Claim 2
Dependent Claim
130 words
A PROCESS FOR PREPARING A LARGE SINGLE CRYSTAL OF CADMIUM SULFIDE, SAID PROCESS COMPRISING, DENSIFYING CADMIUM SULFIDE POWDER BY HEATING IT TO A TEMPERATURE OF SUBSTANTIALLY 900*C. IN A VACUUM, CRUSHING THE DENSIFIED CADMIUM SULFIDE, MELTING SAID DENSIFIED SULFIDE AT A PRESSURE OF AT LEAST 500 P.S.I. IN AN INERT GAS, AT A TEMPERATURE OF AT LEAST ABOUT 1500*C., SAID MELTING BEING EFFECTED RAPIDLY IN A PERIOD OF LESS THAN ABOUT TEN MINUTES SO THAT SUBLIMATION AND DISSOCIATION OF SAID SULFIDE ARE REDUCED, AND MAINTAINING THE MOLTEN SULFIDE UNDER A PRESSURE ABOVE ABOUT 500 P.S.I. WHILE COOLING THE MELT OVER A PERIOD OF AT LEAST ABOUT THREE HOURS, SAID COOLING BEING CONDUCTED IN SUCH MANNER THAT A SUBSTANTIALLY PLANAR SOLID-LIQUID INTERFACE MOVES PROGRESSIVELY THROUGH THE MELT IN A SINGLE DIRECTION.
References Cited (Backward Citations)
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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) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |