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Patent US4447335A successfully refreshed from Google Patents.
US4447335A
Expired / Lapsed
US
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Process for the preparation of thin films of cadmium sulfide and precursor solutions of cadmium ammonia thiocyanate complex useful therein
Assignee: Argus Chemical Corp
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Filing: 1982-03-22
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Granted: 1984-05-08
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Expires: 2002-03-22
Abstract
Abstract A process is provided for the preparation of thin films of cadmium sulfide by deposition of cadmium sulfide formed in the thermal decomposition of an aqueous solution of cadmium ammonia thiocyanate complex, useful particularly in the preparation of thin cadmium sulfide films on electrically-conductive substrates useful in photovoltaic cells, and on thermally-conductive substrates useful in solar energy absorbers, for energy conversion systems.
Inventors
- 👤 Otto E. Loeffler
- 👤 Nirnal S. Jain
- 👤 Otto S. Kauder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:59
CPC Classifications
H; H10; H10P; H10P14/00; H10P14/20; H10P14/26; H10P14/265; H10F; H10F71/00; H10P14/34; H10P14/3402; H10P14/3424; H10P14/3428; H10P14/3438; H10P14/3441; H10P14/3446
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
57 words
An aqueous solution in ammonium hydroxide comprising a cadmium ammonia thiocyanate complex decomposable when heated at a temperature above 65° C. to form a cadmium sulfide insoluble in the solution, having a pH within the range from about 8 to about 10, and a ratio NH 3 :SCN within the range from about 0.5:1 to about 2:1.
Claim 2
Dependent Claim
57 words
An aqueous solution in ammonium hydroxide comprising a cadmium ammonia thiocyanate complex decomposable when heated at a temperature above 65° C. to form a cadmium sulfide insoluble in the solution, having a pH within the range from about 8 to about 10, and a ratio NH 3 :SCN within the range from about 0.5:1 to about 2:1.
Claim 3
Dependent Claim
24 words
An aqueous solution according to claim 1 in which the cadmium content is within the range from about 0.5 to about 10% by weight.
Claim 4
Dependent Claim
17 words
An aqueous solution according to claim 2 in which the cadmium content is about 1% by weight.
Claim 5
Dependent Claim
15 words
An aqueous solution according to claim 1 comprising in addition selenocyanate that deposits cadmium selenide.
Claim 6
Dependent Claim
25 words
An aqueous solution according to claim 1 comprising an impurity metal also forming an ammonia complex and deposited as metal sulfide with the cadmium sulfide.
Claim 7
Dependent Claim
37 words
A process for preparing cadmium ammonia thiocyanate complex which comprises reacting aqueous ammonium thiocyanate solution with cadmium oxide at a temperature at which the reaction proceeds within the range from room temperature up to about 100° C.
Claim 8
Dependent Claim
37 words
A process for preparing cadmium ammonia thiocyanate complex which comprises reacting aqueous ammonium thiocyanate solution with cadmium oxide at a temperature at which the reaction proceeds within the range from room temperature up to about 100° C.
Claim 9
Dependent Claim
26 words
A process according to claim 6 in which the cadmium content of the solution is within the range from about 0.5 to about 10% by weight.
Claim 10
Dependent Claim
19 words
A process according to claim 7 in which the cadmium content of the solution is about 1% by weight.
Claim 11
Dependent Claim
17 words
A process according to claim 6 in which the cadmium solution comprises selenocyanate that deposits cadmium selenide.
Claim 12
Dependent Claim
29 words
A process according to claim 6 in which the cadmium solution comprises an impurity metal also forming an ammonia complex and deposited as metal sulfide with the cadmium sulfide.
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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) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |