US3918948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of maintaining paired glass sheets in alignment during bending
Assignee: PPG Industries Inc
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Filing: 1974-07-19
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Granted: 1975-11-11
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Expires: 1994-07-19
Abstract
Abstract A method and apparatus for maintaining a pair of glass sheets in aligned relationship to one another during their simultaneous bending in the fabrication of laminated curved safety glass windows.
Inventors
- 👤 Tulio J Monzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:55
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10807; B32B17/10899; B32B17/10954
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
198 words
IN A METHOD OF FABRICATING CURVED GLASS WINDSHIELDS COMPRISING A PAIR OF GLASS SHEETS OF MATCHING CURVATURE, WHEREIN SAID PAIR OF GLASS SHEETS IS ASSEMBLED IN ALIGNED STACKED RELATION WITH ONE SHEET OF SAID PAIR FORMING THE UPPER SHEET OF SAID ASSEMBLE AND THE OTHER SHEET OF SAID PAIR FORMING THE LOWER SHEET OF SAID ASSEMBLY, SAID SHEETS ARE MOUNTED IN SAID ASSEMBLED RELATION ON A BENDING MOLD, AND SAID MOLD MIVED INTO A ENCLOSED HOT ATMOSPHERE WHERE SAID GLASS SHEETS ARE SUBJECTED TO AN ELECATED TEMPERATURE SUFFICIENT TO SOLTEN SAID GLASS SHEETS SO THAT THEY CONFORM TO THE SHAPE OF THE MOLD AND TO ONE ANOTHER SO THAT SAID GLASS SHEETS ARE CAPABLE OF LAMINATION TO ONE ANOTHER WITHOUT BREAKAGE, WHEREIN SAID MOLD WITH SAID GLASS SHEETS MOUNTED THEREON IS MOVED AT A SPEED THAT CHANGES SUFFICIENTLY TO TEND TO CAUSE THE UPPER GLASS SHEET OF SAID PAIR TO SLIDE OUT OF ALIGNMENT WITH SAID LOWER GLASS SHEET, THE IMPROVEMENT COMPRISING ASSEMBLING SAID GLASS SHEETS IN THE FLAT CONDITION IN ALIGNED RELATION TO ONE ANOTHER SUPPORTING THE ASSEMBLY SO FORMED BENEATH PRESSURE APPLYING MEANS, PROVIDING RELATIVE MOTION BETWEEN SAID ASSEMBLY AND SAID PRESSURE APPLYING MEANS ACROSS AN
Claim 2
Dependent Claim
198 words
IN A METHOD OF FABRICATING CURVED GLASS WINDSHIELDS COMPRISING A PAIR OF GLASS SHEETS OF MATCHING CURVATURE, WHEREIN SAID PAIR OF GLASS SHEETS IS ASSEMBLED IN ALIGNED STACKED RELATION WITH ONE SHEET OF SAID PAIR FORMING THE UPPER SHEET OF SAID ASSEMBLE AND THE OTHER SHEET OF SAID PAIR FORMING THE LOWER SHEET OF SAID ASSEMBLY, SAID SHEETS ARE MOUNTED IN SAID ASSEMBLED RELATION ON A BENDING MOLD, AND SAID MOLD MIVED INTO A ENCLOSED HOT ATMOSPHERE WHERE SAID GLASS SHEETS ARE SUBJECTED TO AN ELECATED TEMPERATURE SUFFICIENT TO SOLTEN SAID GLASS SHEETS SO THAT THEY CONFORM TO THE SHAPE OF THE MOLD AND TO ONE ANOTHER SO THAT SAID GLASS SHEETS ARE CAPABLE OF LAMINATION TO ONE ANOTHER WITHOUT BREAKAGE, WHEREIN SAID MOLD WITH SAID GLASS SHEETS MOUNTED THEREON IS MOVED AT A SPEED THAT CHANGES SUFFICIENTLY TO TEND TO CAUSE THE UPPER GLASS SHEET OF SAID PAIR TO SLIDE OUT OF ALIGNMENT WITH SAID LOWER GLASS SHEET, THE IMPROVEMENT COMPRISING ASSEMBLING SAID GLASS SHEETS IN THE FLAT CONDITION IN ALIGNED RELATION TO ONE ANOTHER SUPPORTING THE ASSEMBLY SO FORMED BENEATH PRESSURE APPLYING MEANS, PROVIDING RELATIVE MOTION BETWEEN SAID ASSEMBLY AND SAID PRESSURE APPLYING MEANS ACROSS AN
Claim 3
Dependent Claim
70 words
The improvement as in claim 1, wherein parting material in the form of a fluid dispersion of small particles is applied to an interfacial surface between said glass sheets before said sheets are assembled in said aligned relation to prevent said glass sheets from fusing together while said assembly is exposed to said elevated temperature, said parting material tending to reduce the friction between said glass sheets of said assembly.
Claim 4
Dependent Claim
63 words
In the method as in claim 1, wherein said curved glass windshields have a pattern of coating material applied to an outwardly facing surface of one of said glass sheets, the further step of applying said pattern of coating material to the upper surface of the upper glass sheet of said aligned assembly prior to mounting said aligned assembly on said bending mold.
Claim 5
Dependent Claim
41 words
In the method as in claim 3, including passing said assembly beneath freely rotatable nipper rolls held in pressurized engagement against the upper surface of said assembly prior to applying said pattern of coating material to force out said entrapped fluid.
Claim 6
Dependent Claim
35 words
In the method as in claim 3, including passing a squeegee held in pressurized engagement against the upper surface of said assembly after applying said pattern of coating material to force out said entrapped fluid.
Claim 7
Dependent Claim
36 words
In the method as in claim 1, including passing said assembly beneath freely rotatable nipper rolls held in pressurized engagement against the upper surface of said assembly prior to mounting said assembly on said bending mold.
References Cited (Backward Citations)
US1892987A
Cited
US3265484A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |