US3150950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Working glass
Assignee: PPG Industries Inc
•
Filing: 1960-10-03
•
Granted: 1964-09-29
•
Expires: 1980-10-03
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas D English
- 👤 David C Rich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 04:17
CPC Classifications
C; C03; C03B; C03B33/00; C03B33/09
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
71 words
IN A METHOD OF CUTTING A HEAT STRENGTHENED SHEET OF GLASS, THE STEPS COMPRISING SCORING A SURFACE OF THE GLASS TO A DEPTH LESS THAN THE DEPTH OF THE GLASS THAT IS UNDER A PERMANENT COMPRESSIVE STRESS, HEATING THE GLASS TO AN ELEVATED TEMPERATURE JUST BELOW ITS STRAIN REGION, RAPIDLY COOLING THE GLASS TO COUNTERACT PERMANENT COMPRESSIVE STRESS AND, WHILE PERMANENT COMPRESSIVE STRESS IS COUNTERACTED, BREAKING THE GLASS ALONG THE SCORE.
References Cited (Backward Citations)
US2243149A
Cited
US2148630A
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US2177324A
Cited
US2293537A
Cited
US2311846A
Cited
US2539159A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-29 | 1968-03-30 | 1968-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-29 | 1972-03-30 | 1972-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-29 | 1976-03-30 | 1976-09-29 | $7700.00 | Window Closed / Lapsed |