US4229491A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing cadmium stannate layers
Assignee: Schott AG
•
Filing: 1978-12-13
•
Granted: 1980-10-21
•
Expires: 1998-12-13
Abstract
Abstract A dipping process for the production of cadmium stannate layers on a substrate, preferably glass, which comprises: (a) dipping said substrate into an alcoholic solution of a reaction product containing cadmium and tin, said solution consisting essentially of compounds having hydrolyzable and pyrolyzable residues; (b) withdrawing the substrate from said solution in a humid atmosphere; and (c) gradually heating the coated substrate to 650° C., whereby hydrolysis and pyrolysis removes said residues from the coated substrate to form a coated substrate in which the molar ratio Cd:Sn corresponds to that of said alcoholic dipping solution.
Inventors
- 👤 Helmut Dislich
- 👤 Paul Hinz
- 👤 Gunther Wolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:43
CPC Classifications
C; C01; C01G; C01G19/00; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C03C17/25; C03C17/253; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/23; C03C2217/232; C03C2217/24; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/111
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
110 words
In a dipping process for the production of cadmium stannate layers on a substrate, the improvement which comprises: (a) dipping said substrate into an alcoholic solution of a reaction product containing cadmium and tin derived from a cadmium compound and a tin compound, said solution consisting essentially of compounds having hydrolyzable and pyrolyzable residues; (b) withdrawing the substrate from said solution in an atmosphere sufficiently humid for the subsequent hydrolysis; and (c) gradually heating the coated substrate to 650° C., whereby hydrolysis and pyrolysis removes said residues from the coated substrate to form a coated substrate in which the molar ratio Cd:Sn corresponds to that of said alcoholic dipping solution.
Claim 2
Dependent Claim
110 words
In a dipping process for the production of cadmium stannate layers on a substrate, the improvement which comprises: (a) dipping said substrate into an alcoholic solution of a reaction product containing cadmium and tin derived from a cadmium compound and a tin compound, said solution consisting essentially of compounds having hydrolyzable and pyrolyzable residues; (b) withdrawing the substrate from said solution in an atmosphere sufficiently humid for the subsequent hydrolysis; and (c) gradually heating the coated substrate to 650° C., whereby hydrolysis and pyrolysis removes said residues from the coated substrate to form a coated substrate in which the molar ratio Cd:Sn corresponds to that of said alcoholic dipping solution.
Claim 3
Dependent Claim
13 words
A process according to claim 1, wherein said hydrolyzable groups are alkanol residues.
Claim 4
Dependent Claim
24 words
A process according to claim 2, wherein said alkanol residues are selected from the group consisting of methoxy, ethoxy, propoxy, butoxy and mixtures thereof.
Claim 5
Dependent Claim
25 words
A process according to claim 2, wherein the pyrolyzable residues are selected from the group consisting of formate, acetate, propionate or higher carboxylic acid residues.
Claim 6
Dependent Claim
34 words
A process according to one of claims 2 to 4, wherein said dipping solution further contains an additive selected from the group consisting of hydrolyzable or pyrolyzable indium, lead, aluminium, titanium or niobium compounds.
Claim 7
Dependent Claim
17 words
A process according to claim 5 wherein the molar ratio of Cd:Sn in the layer is 1:1.
Claim 8
Dependent Claim
17 words
A process according to claim 5 wherein the molar ratio of Cd:Sn in the layer is 2:1.
Claim 9
Dependent Claim
21 words
A process according to one of claims 1 to 4, wherein the molar ratio of Cd:Sn in the layer is 1:1.
Claim 10
Dependent Claim
21 words
A process according to one of claims 1 to 4, wherein the molar ratio of Cd:Sn in the layer is 2:1.
References Cited (Backward Citations)
US3811953A
Cited
US4048372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |