US2837453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preliminary pressing of laminated glass
Assignee: PPG Industries Inc
•
Filing: 1955-08-19
•
Granted: 1958-06-03
•
Expires: 1975-08-19
Abstract
No abstract record available.
Inventors
- 👤 Oscar D Englehart
- 👤 John R Sadesky
- 👤 John W Morris
- 👤 Roy S Sherbondy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:39
CPC Classifications
B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10807; B32B17/10816; B32B17/10825; B32B17/10834; B32B17/10844; B32B17/10889
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
THE METHOD OF PREPRESSING AT LEAST THE MARGINAL AREA OF AN ASSEMBLY COMPRISING TWO MATCHED SHEETS OF GLASS AND A THERMOPLASTIC INTERLAYER, WHICH COMPRISES SUPPORTING THE ASSEMBLY ON FLEXIBLE SHEET WITHIN AN AREA OF THE SHEET DEFINED BY A CONTINUOUS RIB ON THE TOP SURFACE OF THE SHEET AND SPACING THE PERIPHERY OF THE ASSEMBLY FROM THE RIB, PLACING A FLEXIBLE COVER SHEET OVER THE ASSEMBLY AND THE RIB TO COVER THE ENTIRE AREA OF THE FLEXIBLE SHEET DEFINED BY THE RIB AND MAINTAIN A CONDUIT AROUND THE PERIPHERY OF THE ASSEMBLY, EVACUATING THE CONDUIT THROUGH THE RIB WHILE MAINTAINING AIR PASSAGES FROM THE PERIPHERY OF THE ASSEMBLY TO THE POINT OF EVACUATION AT THE RIB, MAINTAINING THE VACUUM WHILE HEATING AT LEAST THE MARGINAL AREA OF THE GLASS SHEETS AND INTERLAYER, RELEASING THE VACUUM, REMOVING THE COVER SHEET AND REMOVING THE ASSEMBLY OF GLASS SHEETS AND INTERLAYER.
Claim 2
Independent Claim
148 words
THE METHOD OF PREPRESSING AT LEAST THE MARGINAL AREA OF AN ASSEMBLY COMPRISING TWO MATCHED SHEETS OF GLASS AND A THERMOPLASTIC INTERLAYER, WHICH COMPRISES SUPPORTING THE ASSEMBLY ON FLEXIBLE SHEET WITHIN AN AREA OF THE SHEET DEFINED BY A CONTINUOUS RIB ON THE TOP SURFACE OF THE SHEET AND SPACING THE PERIPHERY OF THE ASSEMBLY FROM THE RIB, PLACING A FLEXIBLE COVER SHEET OVER THE ASSEMBLY AND THE RIB TO COVER THE ENTIRE AREA OF THE FLEXIBLE SHEET DEFINED BY THE RIB AND MAINTAIN A CONDUIT AROUND THE PERIPHERY OF THE ASSEMBLY, EVACUATING THE CONDUIT THROUGH THE RIB WHILE MAINTAINING AIR PASSAGES FROM THE PERIPHERY OF THE ASSEMBLY TO THE POINT OF EVACUATION AT THE RIB, MAINTAINING THE VACUUM WHILE HEATING AT LEAST THE MARGINAL AREA OF THE GLASS SHEETS AND INTERLAYER, RELEASING THE VACUUM, REMOVING THE COVER SHEET AND REMOVING THE ASSEMBLY OF GLASS SHEETS AND INTERLAYER.
References Cited (Backward Citations)
US1870284A
Cited
US2376805A
Cited
US2700632A
Cited
US2673822A
Cited
US2713378A
Cited
US2714567A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-02 | 1961-12-02 | 1962-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-02 | 1965-12-02 | 1966-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-02 | 1969-12-02 | 1970-06-03 | $7700.00 | Window Closed / Lapsed |