Patent US2693422A successfully refreshed from Google Patents.
US2693422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition of glass having high ultraviolet and low visual transmission
Assignee: PPG Industries Inc
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Filing: 1951-08-25
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Granted: 1954-11-02
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Expires: 1971-08-25
Abstract
No abstract record available.
Inventors
- 👤 Duncan James Earle
- 👤 John J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:26
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/078; C03C1/00; C03C1/10; C03C4/00; C03C4/08; Y; Y10; Y10S; Y10S501/00; Y10S501/90; Y10S501/905
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A GLASS HAVING SUBSTANTIALLY THE FOLLOWING COMPOSITION BY WEIGHT AND CHARACTERIZED BY RELATIVELY HIGH ULTRAVIOLET TRANSMISSION IN THE RADIANT ENERGY BAND FROM ABOUT 325 TO 425 MILLIMICRONS, AND VERY LOW VISUAL TRANSMISSION:
Claim 2
Dependent Claim
32 words
A GLASS HAVING SUBSTANTIALLY THE FOLLOWING COMPOSITION BY WEIGHT AND CHARACTERIZED BY RELATIVELY HIGH ULTRAVIOLET TRANSMISSION IN THE RADIANT ENERGY BAND FROM ABOUT 325 TO 425 MILLIMICRONS, AND VERY LOW VISUAL TRANSMISSION:
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) | 1957-11-01 | 1958-05-03 | 1958-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-01 | 1962-05-03 | 1962-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-01 | 1966-05-03 | 1966-11-02 | $7700.00 | Window Closed / Lapsed |