US3223507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of heat treating glass sheets
Assignee: PPG Industries Inc
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Filing: 1964-06-17
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Granted: 1965-12-14
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Expires: 1984-06-17
Abstract
No abstract record available.
Inventors
- 👤 Dean L Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:17
CPC Classifications
C; C03; C03B; C03B27/00; C03B27/04; C03B27/0404; C03B27/044; C03B27/048; C03B29/00; C03B29/04; C03B29/06; C03B29/08; C03B29/12; C03B35/00; C03B35/14; C03B35/22; C03B35/24; C03B35/243; C03B2225/00; C03B2225/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
IN A METHOD OF TEMPEING GLASS IN WHICH THE GLASS IS AT LEAST PARTIALLY SUPPORTED WHILE IT IS AT A DEFORMATION TEMPERATURE AND IS THEREAFTER QUENCHED, THE IMPROVEMENT WHICH COMPRISES FIRST HEATING THE GLASS TO A TEMPERATURE HIGHER THAN THE MINIMUM DEFORMATION TEMPERATURE REQUIRED FOR TEMPERING; AND, IMMEDIATELY PRIOR TO TEMPERING, HEATING THE SURFACES OF SAID GLASS AT A LOWER TEMPERATURE WHILE MAINTAINING THE TEMPRERATURE OF THE GLASS ABOVE THE MINIMUM DEFORMATION TEMPERATURE FOR TEMPERING UNTIL DISTORTION OF THE GLASS WHICH ORDINARILY OCCURS DURING THE TEMPERING OF SAID GLASS AFTER SAID FIRST HEATING THEROF IS SUBSTANTIALLY REDUCED, AND THEN QUENCHING THE GLASS.
Claim 2
Dependent Claim
102 words
IN A METHOD OF TEMPEING GLASS IN WHICH THE GLASS IS AT LEAST PARTIALLY SUPPORTED WHILE IT IS AT A DEFORMATION TEMPERATURE AND IS THEREAFTER QUENCHED, THE IMPROVEMENT WHICH COMPRISES FIRST HEATING THE GLASS TO A TEMPERATURE HIGHER THAN THE MINIMUM DEFORMATION TEMPERATURE REQUIRED FOR TEMPERING; AND, IMMEDIATELY PRIOR TO TEMPERING, HEATING THE SURFACES OF SAID GLASS AT A LOWER TEMPERATURE WHILE MAINTAINING THE TEMPRERATURE OF THE GLASS ABOVE THE MINIMUM DEFORMATION TEMPERATURE FOR TEMPERING UNTIL DISTORTION OF THE GLASS WHICH ORDINARILY OCCURS DURING THE TEMPERING OF SAID GLASS AFTER SAID FIRST HEATING THEROF IS SUBSTANTIALLY REDUCED, AND THEN QUENCHING THE GLASS.
References Cited (Backward Citations)
US2042610A
Cited
US2826868A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |