Patent US3960741A successfully refreshed from Google Patents.
US3960741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Etchant for removing metals from glass substrates
Assignee: General Electric Co
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Filing: 1974-08-28
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Granted: 1976-06-01
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Expires: 1994-08-28
Abstract
Abstract Disclosed is an etchant for removing a metal, such as titanium, from a glass substrate without adversely attacking the glass. The etchant includes a relatively viscous coating agent that wets and coats and thus protects the glass but does not wet the metal thus permitting etching thereof. A nonionizing diluent can be included in the etchant to inhibit the etching rate if it is felt that the heat and turbulence that would otherwise be generated may be excessive and interfere with the action of the coating agent.
Inventors
- 👤 Sami I. Gabrail
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 04:23
CPC Classifications
C; C23; C23F; C23F1/00; C23F1/10; C23F1/14; C23F1/16
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
An etchant for removing metal from a glass substrate comprising: hydrofluoric acid for oxidizing said metal to form a metal oxide; nitric acid for reducing said metal oxide; and lactic acid for protectively coating said glass substrate and inhibiting attack thereof by said hydrofluoric acid and nitric acid.
Claim 2
Dependent Claim
48 words
An etchant for removing metal from a glass substrate comprising: hydrofluoric acid for oxidizing said metal to form a metal oxide; nitric acid for reducing said metal oxide; and lactic acid for protectively coating said glass substrate and inhibiting attack thereof by said hydrofluoric acid and nitric acid.
Claim 3
Dependent Claim
18 words
An etchant according to claim 1 further comprising acetic acid for diluting said hydrofluoric acid and nitric acid.
Claim 4
Dependent Claim
34 words
An etchant for removing metal from a glass substrate, said etchant comprising essentially, in volume percent: Hydrofluoric Acid
(50% assay) 0.1-5%
Nitric Acid (70.5% assay) 10-60%
Acetic Acid 30-65%
Lactic Acid (85% assay) 15-60%.
Claim 5
Dependent Claim
34 words
An etchant for removing metal from a glass substrate, said etchant comprising essentially, in volume percent: Hydrofluoric Acid
(50% assay) 0.1-5%
Nitric Acid (70.5% assay) 10-60%
Acetic Acid 30-65%
Lactic Acid (85% assay) 15-60%.
Claim 6
Dependent Claim
34 words
An etchant for removing titanium from a glass substrate, said etchant comprising essentially, in volume percent: Hydrofluoric Acid
(50% assay) 1%
Nitric Acid (70.5% assay) 20%
Acetic Acid 54%
Lactic Acid (85% assay) 25%.
Claim 7
Dependent Claim
34 words
An etchant for removing titanium from a glass substrate, said etchant comprising essentially, in volume percent: Hydrofluoric Acid
(50% assay) 1%
Nitric Acid (70.5% assay) 20%
Acetic Acid 54%
Lactic Acid (85% assay) 25%.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-01 | 1979-12-01 | 1980-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-01 | 1983-12-01 | 1984-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-01 | 1987-12-01 | 1988-06-01 | $7700.00 | Window Closed / Lapsed |