Patent US3954518A successfully refreshed from Google Patents.
US3954518A
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Method for reducing compositional gradients in mercury cadmium telluride
Assignee: Honeywell Inc
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Filing: 1975-02-19
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Granted: 1976-05-04
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Expires: 1995-02-19
Abstract
Abstract Compositional gradients in a body of mercury cadmium telluride are removed by heat treating the mercury cadmium telluride in a closed container at a temperature which is less than the solidus temperature. The constituent vapor pressure within the closed container is maintained at a value which is lower than the equivalent vapor pressure of the constituents of the mercury cadmium telluride body.
Inventors
- 👤 Joseph L. Schmit
- 👤 M. Walter Scott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:54
CPC Classifications
H; H10; H10P; H10P95/00; H10P95/90; C; C22; C22F; C22F1/00; C22F1/02; C30; C30B; C30B29/00; C30B29/10; C30B29/46; C30B29/48; C30B33/00; Y; Y10; Y10S; Y10S438/00; Y10S438/971
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
72 words
In a method of reducing compositional gradients in mercury cadmium telluride by heat treating a mercury cadmium telluride body in a closed container at a temperature near the solidus temperature, the closed container also containing a source of excess mercury vapor, the improvement comprising: maintaining a mercury vapor pressure within the closed container which is lower than the equilibrium vapor pressure of mercury over a mercury cadmium telluride body at the temperature.
Claim 2
Dependent Claim
72 words
In a method of reducing compositional gradients in mercury cadmium telluride by heat treating a mercury cadmium telluride body in a closed container at a temperature near the solidus temperature, the closed container also containing a source of excess mercury vapor, the improvement comprising: maintaining a mercury vapor pressure within the closed container which is lower than the equilibrium vapor pressure of mercury over a mercury cadmium telluride body at the temperature.
Claim 3
Independent Claim
102 words
A method of reducing compositional gradients in mercury cadmium telluride, the method comprising: heat treating a mercury cadmium telluride body in the presence of mercury vapor from a source other than the body, in a first portion of a capsule at a temperature near the solidus temperature of the mercury cadmium telluride body; and while maintaining a second portion of the capsule at a temperature less than the temperature of the first portion, whereby mercury vapor pressure within the capsule is lower than the equilibrium vapor pressure of mercury over a mercury cadmium telluride body at the temperature of the first portion.
Claim 4
Independent Claim
102 words
A method of reducing compositional gradients in mercury cadmium telluride, the method comprising: heat treating a mercury cadmium telluride body in the presence of mercury vapor from a source other than the body, in a first portion of a capsule at a temperature near the solidus temperature of the mercury cadmium telluride body; and while maintaining a second portion of the capsule at a temperature less than the temperature of the first portion, whereby mercury vapor pressure within the capsule is lower than the equilibrium vapor pressure of mercury over a mercury cadmium telluride body at the temperature of the first portion.
Claim 5
Dependent Claim
24 words
The method of claim 2 wherein the second portion is maintained at a temperature about 200°C less than the temperature of the first portion.
Claim 6
Independent Claim
99 words
A method for reducing compositional gradients in mercury cadmium telluride, the method comprising: heat treating a body of mercury cadmium telluride at a first temperature near the solidus temperature in a closed environment; and simultaneously maintaining a quantity of constituents selected from the group consisting of mercury, cadmium, tellurium and mixtures thereof, within the same closed environment, at a second temperature lower than the first temperature of the body, to maintain a mercury vapor pressure in the closed environment which is lower than the equilibrium vapor pressure of mercury over a mercury cadmium telluride body at the first temperature.
Claim 7
Independent Claim
99 words
A method for reducing compositional gradients in mercury cadmium telluride, the method comprising: heat treating a body of mercury cadmium telluride at a first temperature near the solidus temperature in a closed environment; and simultaneously maintaining a quantity of constituents selected from the group consisting of mercury, cadmium, tellurium and mixtures thereof, within the same closed environment, at a second temperature lower than the first temperature of the body, to maintain a mercury vapor pressure in the closed environment which is lower than the equilibrium vapor pressure of mercury over a mercury cadmium telluride body at the first temperature.
References Cited (Backward Citations)
US3723190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-04 | 1979-11-03 | 1980-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-04 | 1983-11-03 | 1984-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-04 | 1987-11-03 | 1988-05-04 | $7700.00 | Window Closed / Lapsed |