Patent US4393881A successfully refreshed from Google Patents.
Patent US2774190A successfully refreshed from Google Patents.
US2774190A
Expired / Lapsed
US
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Annealing glass
Assignee: PPG Industries Inc
•
Filing: 1953-05-18
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Granted: 1956-12-18
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Expires: 1973-05-18
Abstract
No abstract record available.
Inventors
- 👤 Florian V Atkeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:36
CPC Classifications
C; C03; C03B; C03B15/00; C03B15/02; C03B15/12; C03B25/00; C03B25/04; C03B25/10; C03B25/12; Y; Y02; Y02P; Y02P40/00; Y02P40/50; Y02P40/57
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1525132A
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US1540264A
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US1895547A
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US1999588A
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US1988560A
Cited
US2002544A
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US2116693A
Cited
GB475181A
Cited
US2133784A
Cited
US2297737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-18 | 1960-06-18 | 1960-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-18 | 1964-06-18 | 1964-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-18 | 1968-06-18 | 1968-12-18 | $7700.00 | Window Closed / Lapsed |