Patent US2669808A successfully refreshed from Google Patents.
US2669808A
Expired / Lapsed
US
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Glass composition
Assignee: PPG Industries Inc
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Filing: 1951-09-15
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Granted: 1954-02-23
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Expires: 1971-09-15
Abstract
No abstract record available.
Inventors
- 👤 Duncan James Earle
- 👤 John J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:49
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/083; C03C3/085; C03C3/087; C03C1/00; C03C1/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
22 words
A GLASS HAVING SUBSTANTIALLY UNIFORM ABSORPTION OF LIGHT IN THE PORTION OF THE VISIBLE SPECTRUM LYING BETWEEN 440 AND 660 MILLIMICRONS COMPRISING:
Claim 2
Dependent Claim
22 words
A GLASS HAVING SUBSTANTIALLY UNIFORM ABSORPTION OF LIGHT IN THE PORTION OF THE VISIBLE SPECTRUM LYING BETWEEN 440 AND 660 MILLIMICRONS COMPRISING:
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) | 1957-02-22 | 1957-08-24 | 1958-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-22 | 1961-08-24 | 1962-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-22 | 1965-08-24 | 1966-02-23 | $7700.00 | Window Closed / Lapsed |