US3772075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Applying electroconductive heating circuits to glass
Assignee: PPG Industries Inc
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Filing: 1971-07-20
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Granted: 1973-11-13
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Expires: 1991-07-20
Abstract
Abstract Applying a decorative coating or design of electroconductive material to a glass base. When the base is transparent, the resulting article is useful as a readily heated window from which fog and ice can be readily removed on heating. A frit composition having an appropriate coefficient of expansion, an appropriate maturing temperature, and which matures into a rough, porous coating, is applied to a glass sheet surface in the cirucit pattern desired, the sheet is heated and then cooled rapidly to produce a tempered glass sheet having a rough, porous frit coating conforming to the pattern desired for the electroconductive heating circuit, and a conductive metal coating is selectively deposited on the rough, porous frit by electroless plating. The frit may be sensitized by incorporating a minor amount of a sensitizing metal therein or by applying a sensitizing composition.
Inventors
- 👤 M Tarnopol
- 👤 T Snyder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:23
CPC Classifications
C; C23; C23C; C23C18/00; C23C18/16; C23C18/1601; C23C18/1633; C23C18/1646; C23C18/165; C23C18/1653; C03; C03C; C03C17/00; C03C17/34; C03C17/36; C03C17/3602; C03C17/3607; C03C17/3649; C03C17/3668; C03C17/3673; C03C17/3684; C23C18/1603; C23C18/1607; C23C18/1608; H; H05; H05B; H05B3/00; H05B3/84; C03C2217/00; C03C2217/40; C03C2217/43; C03C2217/44; C03C2217/45; C03C2217/452; C03C2217/46; C03C2217/47; C03C2217/475; C03C2217/479; C03C2217/48; C03C2217/485; C03C2217/70; C03C2217/72; C03C2218/00; C03C2218/30; C03C2218/34; H05B2203/00; H05B2203/017
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
35 words
heating the coated glass sheet to an elevated temperature for sufficient time to evaporate said liquid and to fuse the frit to produce a rough, porous frit coating having a pattern conforming to that desired,
Claim 2
Dependent Claim
23 words
A method of depositing a pattern of electroconductive material on a trasparent glass base as in claim 1 which comprises the following steps:
Claim 3
Dependent Claim
25 words
rapidly cooling said frit coated glass sheet to harden said rough, porous frit coating and to impart at least a partial temper to the glass,
Claim 4
Dependent Claim
53 words
The method as in claim 2, wherein said sensitizing step is performed between the fusing step and the electroless plating step and comprises treating the fritcoated glass sheet with a sensitizing composition of a metal taken from the class of sensitizing metals consisting of cuprous copper, stannous tin, nickel, palladium and mixtures thereof.
Claim 5
Dependent Claim
52 words
The method as in claim 2, wherein saId sensitizing step consists essentially of including a minor proportion of a sensitizing metal from the class consisting of palladium, platinum, gold, silver, rhodium, copper, iron, aluminum and tungsten and mixtures of at least two of said sensitizing metals in said finely divided ceramic frit.
Claim 6
Dependent Claim
5 words
sensitizing said rough, porous frit,
Claim 7
Dependent Claim
32 words
exposing said partly coated transparent glass sheet to an electroless plating bath containing a salt of an electroconductive metal to deposit an electroconductive metallic coating selectively onto said sensitized frit coating, and
Claim 8
Dependent Claim
23 words
The method as in claim 4, wherein said sensitizing metal is incorporated in the form of a soluble compound of said sensitizing metal.
Claim 9
Dependent Claim
29 words
The method as in claim 4, wherein said source of sensitizing metal is an organic solution of a mixture of organic compounds of at least two of said metals.
Claim 10
Dependent Claim
16 words
applying a protective coating of electrical insulator material to the metallic coating so formed by electropainting.
Claim 11
Dependent Claim
72 words
The method as in claim 4, further including the step of applying to said surface a mild, acidic, etching solution that does not harm the transparent glass base but that reacts with said frit for sufficient time to increase the number of free atoms of said sensitizing metal that is exposed but insufficient time to remove said frit completely after said rapid cooling step and before said exposure to said electroless bath.
Claim 12
Dependent Claim
32 words
The method as in claim 1, wherein said finely divided sensitized ceramic frit is applied along a series of elongated grooves previously formed along the surface area of said transparent glass sheet.
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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |