Patent US4650557A successfully refreshed from Google Patents.
US4650557A
Expired / Lapsed
US
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Process for making a conductively coated glass member and the product thereof
Assignee: Magna Donnelly Corp
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Filing: 1984-09-10
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Granted: 1987-03-17
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Expires: 2004-09-10
Abstract
Abstract The specification discloses a method for making a curved, conductively coated glass member, and the resulting product, by providing for a sufficient degree of substoichiometry at the moment of bend that the glass can be bent using conventional bending techniques without crazing the coating. Two alternative methods for achieving the degree of substoichiometry are disclosed. One involves coating the part to an initial light transmittance (T o ) which is lower than that typically sought by prior artisans. The other involves bending the part in a reducing environment. Also disclosed is a method for increasing conductivity of the coating by exposing the coated part to a reducing environment at temperatures considerably higher than those heretofore thought feasible for use in reduction curing.
Inventors
- 👤 Lowell E. Bitter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:22
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/58; C23C14/5806; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10165; B32B17/10174; C03; C03C; C03C17/00; C03C17/22; C03C17/23; C23C14/06; C23C14/08; C23C14/086; C23C14/5846; H; H05; H05B; H05B3/00; H05B3/84; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/23; C03C2217/231; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/154; C03C2218/30; C03C2218/32; H05B2203/00; H05B2203/017
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
76 words
A process for enhancing the electrical conductivity of an indium-tinoxide film coated on a glass substrate, which comprises first firing the coated substrate in atmosphere to a temperature in excess of about 500 degrees C. but below the softening point of the glass, followed by heating said film to a temperature greater than approximately 400 degrees C. in a reducing environment for a sufficient period of time to substantially lower the electrical resistance of the film.
Claim 2
Dependent Claim
76 words
A process for enhancing the electrical conductivity of an indium-tinoxide film coated on a glass substrate, which comprises first firing the coated substrate in atmosphere to a temperature in excess of about 500 degrees C. but below the softening point of the glass, followed by heating said film to a temperature greater than approximately 400 degrees C. in a reducing environment for a sufficient period of time to substantially lower the electrical resistance of the film.
Claim 3
Dependent Claim
29 words
The process of claim 1 in which said reduction step is performed for sufficient time to give the coating a specific resistivity of less than 3×4 -4 ohm cm.
Claim 4
Dependent Claim
27 words
The process of claim 2 wherein said coating has a thickness of between about one-half to about three wavelengths based on the median wavelength of visible light.
Claim 5
Dependent Claim
29 words
The process of claim 2 wherein said coating has a thickness of between about one-half to about one and one-half wavelengths based on the median wavelength of visible light.
Claim 6
Dependent Claim
32 words
A process according to claim 4 in which said coated substrate is heated in the presence of a mildly reducing gas to approximately 440° C. and held there for approximately 20 minutes.
Claim 7
Dependent Claim
17 words
The process of claim 5 in which said substrate is glass and said coating is indium-tin oxide.
Claim 8
Dependent Claim
11 words
The process of claim 4 in which said substrate is glass.
Claim 9
Dependent Claim
14 words
The process of claim 7 in which said coating is achieved by sputter coating.
Claim 10
Dependent Claim
14 words
The process of claim 4 in which said coating is achieved by sputter coating.
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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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |