US3762902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shaping coating and tempering glass
Assignee: PPG Industries Inc
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Filing: 1972-04-24
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Granted: 1973-10-02
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Expires: 1992-04-24
Abstract
Abstract Shaping, coating and tempering glass sheets in a continuous process comprising supporting a glass sheet in bending relation to a mold, heating the sheet in an enclosed atmosphere until it conforms to the mold, coating at least a surface of the bent sheet while so supported by applying a coating composition for a time sufficient to produce a coating thereon and while exposing its other surface to a cool atmosphere, discontinuing the coating before the glass temperature falls below the strain point, and then quenching both surfaces of the sheet rapidly with relatively cold tempering medium to impart at least a partial temper to the bent coated glass sheet before removing the sheet from the supporting mold. The temperature treatment can also simultaneously fuse a metalo-ceramic frit applied to a portion of the coated surface before said heating starts.
Inventors
- 👤 W Wagner
- 👤 J Golightly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:21
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/04; C03B27/044; C03B27/0442; C03B23/00; C03B23/02; C03B23/023; C03B23/025; C03C; C03C17/00; C03C17/001; C03C17/002; C03C17/22; C03C17/23; C03C17/25; C03C17/253; H; H01; H01B; H01B1/00; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/211; C03C2217/24; C03C2218/00; C03C2218/10; C03C2218/11; C03C2218/112
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
64 words
The method as in claim 1, further including the step of applying to said surface of said glass sheet to be sprayed a stripe of a metalo-ceramic fusible frit capable of fusing to said glass sheet and forming a stripe of electroconductive material fused to said surface when subjected to said heating and chilling, said frit applying step being accomplished prior to said heating.
Claim 2
Dependent Claim
36 words
The method as in claim 2, wherein a pair of said stripes of fusible frit is applied along a pair of opposite side edges of said surface to be sprayed prior to said heating and chilling.
Claim 3
Dependent Claim
21 words
The method as in claim 1, wherein said elevated temperature is within the range of about 1,000* to about 1,300* Fahrenheit.
Claim 4
Dependent Claim
21 words
The method as in claim 1, wherein said quenching is started about 2 to 4 seconds after said coating is discontinued.
Claim 5
Dependent Claim
34 words
The method as in claim 1, for use in coating a glass sheet having a dimension greater than about 12 inches, comprising imparting a motion to said spray in the direction of said dimension.
Claim 6
Dependent Claim
77 words
The method as in claim 6 for use in coating a glass sheet having a relatively narrow portion and a relatively wide portion, comprising regulating said motion imparted to said spray by increasing the rate of movement of said spray relative to the glass sheet surface when it impinges on said relatively narrow portion and decreasing the rate of movement of said spray relative to the glass sheet surface when it impinges on said relatively wide portion.
Claim 7
Dependent Claim
37 words
The method as in claim 1, wherein said spraying is accomplished while moving the origin of said spray relative to said upper surface to have the spray pass over said upper surface several times during said spraying.
Claim 8
Dependent Claim
30 words
The method as in claim 1, wherein said spraying is accomplished using a film forming composition comprising an organic tin compound, an ionizable fluorine containing compound and an organic solvent.
Claim 9
Dependent Claim
66 words
The method as in claim 1, wherein said atmosphere to which said under surface is exposed during said spraying comprises a spray of a film forming composition of a metal compound capable of forming an electroconductive metal oxide film and including a poisoning agent in said film forming composition that causes the resulting film to have less electroconductivity than the film produced on said upper surface.
Claim 10
Dependent Claim
22 words
The method as in claim 1, wherein said upper glass sheet surface is partially masked throughout said heating, spraying and chilling steps.
Claim 11
Independent Claim
200 words
A method of making bent, tempered coated glass sheets comprising the novel sequence of steps comprising: a. supporting a flat glass sheet in bending relation to a mold having a surface conforming to the shape desired for said glass sheet adjacent its marginal periphery, b. heating the supported sheet in an enclosed heated atmosphere to an elevated temperature sufficient to conform the sheet with said surface of said mold, c. applying to one surface of said heated, bent sheet before said glass sheet cools to below its film forming temperature a film forming composition of a metal compound capable of forming a metal oxide coating on contacting a hot glass surface while exposing its opposite surface to an atmosphere colder than said heated atmosphere, d. discontinuing said applying and exposure after fOrming a metal oxide film on said one surface but before said bent glass sheet cools to below its strain point, and e. rapidly chilling both surfaces of the bent, coated glass sheet while said sheet is still supported on said mold from a time when the bent, coated glass sheet is at a temperature above its strain point until said glass sheet develops at least a partial temper.
Claim 12
Dependent Claim
22 words
The method as in claim 12, wherein said elevated temperature is within the range of about 1,000* to about 1, 300* Fahrenheit.
Claim 13
Dependent Claim
21 words
The method as in claim 12, wherein said quenching is started about 2 to 4 seconds after said coating is discontinued.
Claim 14
Dependent Claim
37 words
The method as in claim 12, for use in coating a glass sheet having a dimension greater than about 12 inches, comprising imparting a motion to means to apply said composition in the direction of said dimension.
Claim 15
Dependent Claim
79 words
The method as in claim 15, for use in coating a glass sheet having a relatively narrow portion and a relatively wide portion, comprising regulating said motion imparted to said means by increasing the rate of movement of said means relative to the glass sheet surface when said composition impinges on said relatively narrow portion and decreasing the rate of movement of said means relative to the glass sheet surface when said composition impinges on said relatively wide portion.
Claim 16
Dependent Claim
35 words
The method as in claim 12, wherein said applying is accomplished while moving said applying means relative to said one surface to have the means pass over said one surface several times during said applying.
Claim 17
Dependent Claim
30 words
The method as in claim 12, wherein said applying is accomplished using a film forming composition comprising an organic tin compound, an ionizable fluorine containing compound and an organic solvent.
Claim 18
Dependent Claim
38 words
The method as in claim 12, wherein said atmosphere to which said other surface is exposed during said applying comprises a spray of a film forming composition of a metal compound capable of forming a metal oxide film.
Claim 19
Dependent Claim
22 words
The method as in claim 12, wherein said one glass sheet surface is partially masked throughout said heating, applying and chilling steps.
Claim 20
Independent Claim
198 words
A method of making bent, tempered coated glass sheets comprising the novel sequence of steps comprising: a. supporting a flat glass sheet in bending relation to a mold having a surface conforming to the shape desired for said glass sheet adjacent its marginal periphery, b. heating the supported sheet in an enclosed heated atmosphere to an elevated temperature sufficient to conform the sheet with said surface of said mold, c. applying to one surface of said heated, bent sheet before said glass sheet cools to below its film forming temperature a film forming composition of a metal compound capable of forming a coating on contacting a hot glass surface while exposing its opposite surface to an atmosphere colder than said heated atmosphere, d. discontinuing said applying and exposure after forming a metal oxide film on said one surface but before said bent glass sheet cools to below its strain point, and e. rapidly chilling both surfaces of the bent, coated glass sheet while said sheet is still supported on said mold from a time when the bent, coated glass sheet is at a temperature above its strain point until said glass sheet develops at least a partial temper.
Claim 21
Dependent Claim
21 words
The method as in claim 21 wherein said quenching is started about 2 to 4 seconds after said coating is discontinued.
Claim 22
Dependent Claim
37 words
The method as in claim 21, for use in coating a glass sheet having a dimension greater than about 12 inches, comprising imparting a motion to means to apply said composition in the direction of said dimension.
Claim 23
Dependent Claim
79 words
The method as in claim 23, for use in coating a glass sheet having a relatively narrow portion and a relatively wide portion, comprising regulating said motion imparted to said means by increasing the rate of movement of said means relative to the glass sheet surface when said composition imPinges on said relatively narrow portion and decreasing the rate of movement of said spray relative to the glass sheet surface when said composition impinges on said relatively wide portion.
Claim 24
Dependent Claim
35 words
The method as in claim 21, wherein said applying is accomplished while moving said applying means relative to said one surface to have the means pass over said one surface several times during said applying.
Claim 25
Dependent Claim
22 words
The method as in claim 21, wherein said one glass sheet surface is partially masked throughout said heating, applying and chilling steps.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |