US4093504A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing electrically conductive indium oxide patterns on an insulating support by etching with hydrochloric acid and ferric chloride
Assignee: US Philips Corp
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Filing: 1976-08-05
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Granted: 1978-06-06
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Expires: 1996-08-05
Abstract
Abstract Etching indium patterns on insulating supports with the use of an etchant-resistant mask, by means of a solution of an acid to which ferric chloride has been added. Passivation of the bath is prevented by adding ferric chloride.
Inventors
- 👤 Johannes J. Ponjee
- 👤 Hendrik J. Feil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:28
CPC Classifications
H; H01; H01B; H01B5/00; H01B5/14; G; G02; G02F; G02F1/00; G02F1/01; G02F1/0102; H10; H10F; H10F71/00; H10F71/138; Y; Y02; Y02E; Y02E10/00; Y02E10/50
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
70 words
A method of producing an electrically conductive pattern comprising forming a uniform layer of indium oxide on an electrically insulating support, applying to said indium oxide layer an etch-resistant coating in the negative image of the desired pattern, applying to said thus coated layer an aqueous hydrochloric acid etching solution containing in addition to the acid, ferric chloride in a quantity of between 0.01 mol/l and the saturation concentration thereof.
Claim 2
Independent Claim
70 words
A method of producing an electrically conductive pattern comprising forming a uniform layer of indium oxide on an electrically insulating support, applying to said indium oxide layer an etch-resistant coating in the negative image of the desired pattern, applying to said thus coated layer an aqueous hydrochloric acid etching solution containing in addition to the acid, ferric chloride in a quantity of between 0.01 mol/l and the saturation concentration thereof.
Claim 3
Dependent Claim
25 words
A method as claimed in claim 1 wherein the bath consists of an aqueous solution of HCl which contains 66g of FeCl 3 per liter.
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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) | 1981-06-05 | 1981-12-05 | 1982-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-05 | 1985-12-05 | 1986-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-05 | 1989-12-05 | 1990-06-06 | $7700.00 | Window Closed / Lapsed |