Patent US3654172A successfully refreshed from Google Patents.
US3654172A
Expired / Lapsed
US
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Terbium activated radioluminescent silicate glasses
Assignee: Bayer Corp
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Filing: 1970-03-26
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Granted: 1972-04-04
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Expires: 1990-03-26
Abstract
Abstract THIS INVENTION RELATES TO GLASS COMPOSITIONS WHICH EMIT STRONG, VISIBLE LUMINESCENCE WHEN EXPOSED TO SUCH IONIZING RADIATIONS AS X-RAYS, GAMMA-RAYS OR CATHODE RAYS. IN PARTICULAR, THIS INVENTION RELATES TO GLASSES WITHIN THE ALKALI METAL-ALKALINE EARTH METAL-SILICA COMPOSITION FIELD WHICH ARE ACTIVATED BY TERBIUM TO EMIT STRONG, VISIBLE LUMINECENCE WHEN EXPOSED TO X-RADIATIONS HAVING ENERGIES RANGING FROM 50-120 KILOVOLTS (KV.), SUCH AS ARE COMMONLY ENCOUNTERED IN MEDICAL RADIOGRAPHY PRACTICE.
Inventors
- 👤 Richard F Reade
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:08
CPC Classifications
G; G01; G01T; G01T1/00; G01T1/02; G01T1/10; C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/095; C03C4/00; C03C4/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |