US3762904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for bending a glass sheet to a relatively sharp angle
Assignee: Pilkington North America Inc
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Filing: 1972-08-23
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Granted: 1973-10-02
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Expires: 1992-08-23
Abstract
Abstract A process for bending a glass sheet to a relatively sharp angle including forming a groove in a surface of the sheet along a line about which it is desired to bend the sheet, forming an electrically conducting path on the sheet, and passing an electric current through the path to heat the sheet in the area of the groove to a temperature above the bending point of the glass. The sheet is then caused to be bent along the groove to form a generally V-shaped glazing.
Inventors
- 👤 H Hamilton
- 👤 R Bamford
- 👤 P Pastorek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:50
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/025; C03B23/0258; Y; Y10; Y10S; Y10S65/00; Y10S65/04
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
A process for bending a glass sheet as defined in claim 1, wherein said sheet is heated to an elevated temperature but below the bending temperature of the glass after forming said path but prior to the application of said electrical potential thereto.
Claim 2
Dependent Claim
96 words
A process for bending a glass sheet to a relatively sharp angle, comprising forming a groove in a surface of a flat sheet of glass to be bent, forming an electrically conducting path in said groove, heating the sheet to an elevated temperature but below the bending temperature of the glass, passing an electrical current along said electrically conducting path to heat the sheet in the area of the groove to a temperature above the bending point of the glass, and causing said sheet to bend along said groove to form said relatively sharp angle therein.
Claim 3
Dependent Claim
39 words
A process for bending a glass sheet as defined in claim 3, wherein said sheet is heated to a temperature in the range of from 900* F. to 1,150* F. prior to passing said electrical current along said path.
Claim 4
Dependent Claim
33 words
A process for bending a glass sheet as defined in claim 3, wherein said electrIcally conducting path is produced by stenciling an electrically conducting metal and frit containing paste on the glass surface.
Claim 5
Dependent Claim
115 words
A process for bending a glass sheet to a relatively sharp angle, comprising forming a groove in a surface of a flat sheet of glass to be bent, which groove extends continuously along a line from substantially one edge of the sheet to the opposite edge thereof, forming an electrically conducting path in said groove, heating the sheet to an elevated temperature but below the bending temperature of the glass, passing an electrical current along said electrically conducting path to heat the sheet in the area of the groove to a temperature above the bending point of the glass, and causing said sheet to bend along said groove to form said relatively sharp angle therein.
Claim 6
Dependent Claim
169 words
A process for bending a glass sheet to a relatively sharp angle, comprising forming a groove in a surface of a flat sheet of glass to be bent, which groove extends continuously along a substantially straight line from one edge of the sheet to the opposite edge therof, forming an electrically conducting path in said groove by supplying an electrically conducting metal-containing glass frit suspension thereto, supporting the flat sheet along a portion of its marginal edge only above a shaping surface of a bending mold, heating the sheet to a temperature above the strain point of the glass but below the bending temperature thereof to fuse the metal-glass frit suspension to the glass, applying an electrical potential across the fused path of a sufficient magnitude and for a time adequate to raise the temperature of the glass in the area immediately adjacent said groove to its bending temperature, and causing the sheet to bend by gravity along said groove into conformity with the shaping surface of the mold.
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 |