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US2439192A
Expired / Lapsed
US
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Silicoborate glass
Assignee: Eastman Kodak Co
•
Filing: 1946-08-09
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Granted: 1948-04-06
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Expires: 1966-08-09
Abstract
No abstract record available.
Inventors
- 👤 Sun Kuan-Han
- 👤 Thomas E Callear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:03
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/072; C03C3/064; C03C3/066; C03C3/074
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1964321A
Cited
GB477698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |