US3725008A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of regrowing crystals of cadmium sulphide for scintillation counters
Assignee: AT&T Inc
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Filing: 1970-05-18
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Granted: 1973-04-03
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Expires: 1990-05-18
Abstract
Abstract IN ORDER TO REGROW A MASS OF SMALL CRYSTALS OF CADMIUM SULPHIDE THEY ARE PLACED AT ONE END OF A SEALED EVACUATED TUBE (10-5 TORR TYPICALLY). THIS END OF THE TUBE IS HELD AT A TEMPERATURE WHICH IS APPROXIMATELY EQUAL TO OR SLIGHTLY GREATER THAN THE SUBLIMATION TEMPERATURE OF THE CADMIUM SULPHIDE CRYSTALS, WHILE THE OTHER END OF THE TUBE IS HELD AT A STILL HIGHER TEMPERATURE. THEREBY, TE MASS OF SMALL CRYSTALS IS REGROWN AT THE SAME TUBE SITE UNDER CONDITIONS OF SOLID-VAPOR EQUILIBRIUM, AND IN EFFECT COALESCED INTO LARGER CRYSTALS WHICH ARE USEFUL AS SCINTILLATION PHOSPHORS TO DETECT GAMMA RAYS OF THE ORDER OF 100 KILOVOLT OR MORE.
Inventors
- 👤 R Mikulyak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 09:46
CPC Classifications
C; C01; C01G; C01G11/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |