US3352655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling heat application to glass to repair scored regions
Assignee: PPG Industries Inc
•
Filing: 1964-04-08
•
Granted: 1967-11-14
•
Expires: 1984-04-08
Abstract
No abstract record available.
Inventors
- 👤 Herbert W Barch
- 👤 Richard V Posney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 09:13
CPC Classifications
C; C03; C03B; C03B29/00; C03B29/02; C03B29/025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
IN THE ART OF REPARING A GLASS SHEET HAVING A SCORED REGION SUSCEPTIBLE TO BREAKAGE BDURING THERMAL TREATMENT WHEREIN SAID GLASS SHEET IS HEATED ABOVE THE STRAIN POINT AND COOLED BELOW THE STRAIN POINT FOR SAID THERMAL TREATMENT, THE IMPROVEMENT COMPRISING APPLYING TO SAID SCORED REGION ONLY A HEAT ABSORBING COMPOSITION HAVING A HIGHER RATE OF HEAT ABSORPTION THAN THAT OF GLASS PRIOR TO SAID THERMAL TREATMENT, HEATING SAID SHEET TO A TEMPERATURE BETWEEN IT S STRAIN POINT AND ITS MELTING POINT, WHEREBY SAID HEAT ABSORBING COMPOSITION ABSORBS HEAT FROM THE HOT ATMOSPHERE AT A FASTER RATE THAN THE MAIN BODY OF THE GLASS SHEET AND TRANSFERS SUFFICIENT OF SAID ABSORBED HEAT INTO SAID SCORED REGION DURING SAID HEATING TO CAUSE THE AREA IMMEDIATELY ADJACENT TO THE SCORED REGION TO BE OF A HIGHER TEMPERATURE THAN THE MAIN BODY OF THE GLASS SHEET AND CONTINUING SAID HEATING OF SAID MAIN BODY OF THE GLASS SHEET AT SAID TEMPERATURE RANGE UNTIL SAID SCORED REGION HEALS.
Claim 2
Dependent Claim
164 words
IN THE ART OF REPARING A GLASS SHEET HAVING A SCORED REGION SUSCEPTIBLE TO BREAKAGE BDURING THERMAL TREATMENT WHEREIN SAID GLASS SHEET IS HEATED ABOVE THE STRAIN POINT AND COOLED BELOW THE STRAIN POINT FOR SAID THERMAL TREATMENT, THE IMPROVEMENT COMPRISING APPLYING TO SAID SCORED REGION ONLY A HEAT ABSORBING COMPOSITION HAVING A HIGHER RATE OF HEAT ABSORPTION THAN THAT OF GLASS PRIOR TO SAID THERMAL TREATMENT, HEATING SAID SHEET TO A TEMPERATURE BETWEEN IT S STRAIN POINT AND ITS MELTING POINT, WHEREBY SAID HEAT ABSORBING COMPOSITION ABSORBS HEAT FROM THE HOT ATMOSPHERE AT A FASTER RATE THAN THE MAIN BODY OF THE GLASS SHEET AND TRANSFERS SUFFICIENT OF SAID ABSORBED HEAT INTO SAID SCORED REGION DURING SAID HEATING TO CAUSE THE AREA IMMEDIATELY ADJACENT TO THE SCORED REGION TO BE OF A HIGHER TEMPERATURE THAN THE MAIN BODY OF THE GLASS SHEET AND CONTINUING SAID HEATING OF SAID MAIN BODY OF THE GLASS SHEET AT SAID TEMPERATURE RANGE UNTIL SAID SCORED REGION HEALS.
References Cited (Backward Citations)
US2333186A
Cited
US3260584A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-13 | 1971-05-15 | 1971-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-13 | 1975-05-15 | 1975-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-13 | 1979-05-15 | 1979-11-14 | $7700.00 | Window Closed / Lapsed |