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Patent US2770922A successfully refreshed from Google Patents.
US2770922A
Expired / Lapsed
US
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Radiation colorable chromium glass
Assignee: PPG Industries Inc
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Filing: 1952-05-19
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Granted: 1956-11-20
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Expires: 1972-05-19
Abstract
No abstract record available.
Inventors
- 👤 John V Fitzgerald
- 👤 George S Bachman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:48
CPC Classifications
C; C03; C03C; C03C4/00; C03C4/0078; C03C23/00; C03C23/0005; C03C3/00; C03C3/04; C03C3/076; C03C3/078; Y; Y10; Y10S; Y10S204/00; Y10S204/901
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
52 words
THE METHOD OF MAKING FADE-RESISTANT COLORED GLASS COMPRISING THE STEPS OF FORMING A RADIATION-COLORABLE GLASS SUBSTANTIALLY FREE FROM SUBSTANCES THAT INHIBIT COLORATION OF THE GLASS BY HIGH ENERGY RADIATION AND CONTAINING BETWEEN 0.02 AND 2.0 PERCENT CHROMIUM OXIDE, AND EXPOSING SAID GLASS TO HIGH ENERGY RADIATION SUFFICIENT TO PRODUCE SIGNIFICANT COLORATION THEREOF.
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) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |