Patent US3301650A successfully refreshed from Google Patents.
US3301650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Annealing of glass
Assignee: PPG Industries Inc
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Filing: 1962-02-28
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Granted: 1967-01-31
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Expires: 1982-02-28
Abstract
No abstract record available.
Inventors
- 👤 Cecil R Ward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:05
CPC Classifications
C; C03; C03B; C03B25/00; C03B25/04; C03B25/10; C03B25/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN THE METHOD OF ANNEALING GLASS IN WHICH THE GLASS IS COOLED AT A SUBSTANTIALLY CONSTANT RATE FROM AT LEAST A TEMPERATURE AT THE UPPER LIMIT OF THE ANNEALING RANGE AFTER COOLED AT AN AVERAGE LOWER RATE AT LEAST UNTIL THE TEMPERATURE OF THE GLASS REACHES THE LOWER LIMIT OF THE ANNEALING RANGE, THE IMPROVEMENT WHICH COMPRISES APPLYING A MOMENTARY GASEOUS QUENCH TO THE SURFACES OF THE GLASS WHEN THE RATE OF COOLING IS CHANGED FROM THE SAID FIRST RATE TO THE SAID LOWER RATE.
Claim 2
Dependent Claim
85 words
IN THE METHOD OF ANNEALING GLASS IN WHICH THE GLASS IS COOLED AT A SUBSTANTIALLY CONSTANT RATE FROM AT LEAST A TEMPERATURE AT THE UPPER LIMIT OF THE ANNEALING RANGE AFTER COOLED AT AN AVERAGE LOWER RATE AT LEAST UNTIL THE TEMPERATURE OF THE GLASS REACHES THE LOWER LIMIT OF THE ANNEALING RANGE, THE IMPROVEMENT WHICH COMPRISES APPLYING A MOMENTARY GASEOUS QUENCH TO THE SURFACES OF THE GLASS WHEN THE RATE OF COOLING IS CHANGED FROM THE SAID FIRST RATE TO THE SAID LOWER RATE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-30 | 1970-08-01 | 1971-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-30 | 1974-08-01 | 1975-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-30 | 1978-08-01 | 1979-01-31 | $7700.00 | Window Closed / Lapsed |