US3589883A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for thermally fracturing a ribbon of glass
Assignee: PPG Industries Inc
•
Filing: 1968-05-28
•
Granted: 1971-06-29
•
Expires: 1988-05-28
Abstract
Abstract A METHOD OF STRIPPING THE BULB EDGE FROM A SHEET OF WINDOW GLASS IN A DRAWING MACHINE BY THERMALITY INDUCING STRESSES IN THE GLASS AND CAUSING THE GLASS TO SEPARATE ALONG THE LINE OF STRESS INDUCTION. THE APPARATUS IS A THERMAL SOURCE HAVING A MEANS FOR FOCUSING AND CONTROLLING THE THERMAL OUTPUT TO THE GLASS RIBBON. THE THER- MAL ENERGY IS FOCUSED TO A POINT ON THE SURFACE OF THE GLASS, THE ENERGY BEING IN AN AMOUNT SUFFICIENT TO UPSET THE EXISTING BALANCE OF TENSION AND COMPRESSION THROUGH THE THICKNESS OF THE GLASS AND TO INDUCE A FRACTURE IN THE GLASS.
Inventors
- 👤 Terrence A Dear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:39
CPC Classifications
C; C03; C03B; C03B33/00; C03B33/09; C03B33/02; C03B33/0215; Y; Y10; Y10T; Y10T225/00; Y10T225/30; Y10T225/304; Y10T83/00; Y10T83/02; Y10T83/0333; Y10T83/0341
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |