US3264079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of inspecting tempered glass sheets
Assignee: PPG Industries Inc
•
Filing: 1962-04-09
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Granted: 1966-08-02
•
Expires: 1982-04-09
Abstract
No abstract record available.
Inventors
- 👤 Harold E Mckelvey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 02:27
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/02; C03B27/028; C03B27/04; C03B27/0417
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
IN THE PROCESS OF TEMPERING GLASS SHEETS BY FIRST HEATING THE GLASS SHEETS IN A RELATIVELY HOT ATMOSPHERE TO AN ELEVATED TEMPERATURE SUFFICIENT FOR TEMPERING AND SUDDENLY QUENCHING THE HEATED GLASS SHEETS WITH A CHILLING FLUID IN A RELATIVELY COLD ATMOSPHERE FOR SUFFICIENT TIME TO IMPART A TEMPER THERETO UNDER NORMAL OPERATING CONDITIONS, THE IMPROVEMENT COMPRISING SENSING THE TEMPERATURE OF EACH SAID TREATED GLASS SHEET AT THE END OF SAID TIME BUT BEFORE THE SHEET COOLS TO ROOM TEMPERATURE TO DETERMINE WHETHER THE TEMPERATURE OF SAID TREATED GLASS SHEET IS ABOVE OR BELOW THE TEMPERATURE OF PROPERLY TEMPERED GLASS AT THAT TIME, AND MARKING ONLY SAID TREATED GLASS SHEETS WHOSE MEASURED TEMPERATURE IS ABOVE SAID TEMPERATURE OF PROPERLY TEMPERED GLASS TO DISSTINGUISH SAID TREATED GLASS SHEETS WHOSE TEMPERATURE IS ABOVE SAID TEMPERATURE OF PROPERLY TEMPERED GLASS FROM THOSE WHOSE TEMPERATURE IS THAT OF PROPERLY TEMPERED GLASS.
Claim 2
Dependent Claim
146 words
IN THE PROCESS OF TEMPERING GLASS SHEETS BY FIRST HEATING THE GLASS SHEETS IN A RELATIVELY HOT ATMOSPHERE TO AN ELEVATED TEMPERATURE SUFFICIENT FOR TEMPERING AND SUDDENLY QUENCHING THE HEATED GLASS SHEETS WITH A CHILLING FLUID IN A RELATIVELY COLD ATMOSPHERE FOR SUFFICIENT TIME TO IMPART A TEMPER THERETO UNDER NORMAL OPERATING CONDITIONS, THE IMPROVEMENT COMPRISING SENSING THE TEMPERATURE OF EACH SAID TREATED GLASS SHEET AT THE END OF SAID TIME BUT BEFORE THE SHEET COOLS TO ROOM TEMPERATURE TO DETERMINE WHETHER THE TEMPERATURE OF SAID TREATED GLASS SHEET IS ABOVE OR BELOW THE TEMPERATURE OF PROPERLY TEMPERED GLASS AT THAT TIME, AND MARKING ONLY SAID TREATED GLASS SHEETS WHOSE MEASURED TEMPERATURE IS ABOVE SAID TEMPERATURE OF PROPERLY TEMPERED GLASS TO DISSTINGUISH SAID TREATED GLASS SHEETS WHOSE TEMPERATURE IS ABOVE SAID TEMPERATURE OF PROPERLY TEMPERED GLASS FROM THOSE WHOSE TEMPERATURE IS THAT OF PROPERLY TEMPERED GLASS.
References Cited (Backward Citations)
US2669069A
Cited
US3191857A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-01 | 1970-01-31 | 1970-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-01 | 1974-01-31 | 1974-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-01 | 1978-01-31 | 1978-08-02 | $7700.00 | Window Closed / Lapsed |