US4028145A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stoichiometric annealing of mercury cadmium telluride
Assignee: Honeywell Inc
•
Filing: 1975-10-29
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Granted: 1977-06-07
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Expires: 1995-10-29
Abstract
Abstract The stoichiometry and free-carrier concentration of mercury cadmium telluride is adjusted by annealing the mercury cadmium telluride in the presence of cadmium vapor.
Inventors
- 👤 Anthony F. Kasenga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:00
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/40; H10P95/00; H10P95/90; Y; Y10; Y10S; Y10S438/00; Y10S438/971
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
68 words
A process for controlling stoichiometry and free-carrier concentration of a mercury cadmium telluride alloy, the process comprising: providing a body of the alloy and a cadmium vapor source other than the body in a closed environment; and heat treating the body in the presence of the excess cadmium vapor and maintaining the body at a temperature for a time of sufficient duration to adjust stoichiometry and free-carrier concentration.
Claim 2
Dependent Claim
68 words
A process for controlling stoichiometry and free-carrier concentration of a mercury cadmium telluride alloy, the process comprising: providing a body of the alloy and a cadmium vapor source other than the body in a closed environment; and heat treating the body in the presence of the excess cadmium vapor and maintaining the body at a temperature for a time of sufficient duration to adjust stoichiometry and free-carrier concentration.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein the temperature is between about 200° and about 500° C.
Claim 4
Dependent Claim
16 words
The process of claim 2 wherein the temperature is between about 250° and about 350° C.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the time of sufficient duration is greater than about 10 days.
Claim 6
Independent Claim
61 words
A method of adjusting stoichiometry and free-carrier concentration of a body of mercury cadmium telluride, the method comprising heat treating, within a temperature range for a time sufficient to adjust stoichiometry and free-carrier concentration, the body in a closed container in the presence of cadmium vapor from a cadmium vapor source within the closed container and placed remote from the body.
Claim 7
Independent Claim
61 words
A method of adjusting stoichiometry and free-carrier concentration of a body of mercury cadmium telluride, the method comprising heat treating, within a temperature range for a time sufficient to adjust stoichiometry and free-carrier concentration, the body in a closed container in the presence of cadmium vapor from a cadmium vapor source within the closed container and placed remote from the body.
Claim 8
Dependent Claim
17 words
The method of claim 5 wherein the temperature range is between about 250° and about 350° C.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |