US2867541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing transparent luminescent screens
Assignee: General Electric Co
•
Filing: 1957-02-25
•
Granted: 1959-01-06
•
Expires: 1977-02-25
Abstract
No abstract record available.
Inventors
- 👤 Henry D Coghill
- 👤 Lewis R Koller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:27
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
THE METHOD OF PREPARING A TRANSPARENT LUMINESCENT SCREEN WHICH METHOD COMPRISES THE STEPS OF VACUMN EVAPORATING UPON A TRANSPARENT SUBSTRATE A FIRST CRYSTALLINE LAYER OF PHOSPHOR HOST MATERIAL, VACUUM EVAPORATING UPON THE CRYSTALLINE LAYER A SECOND AMORPHOUS LAYER OF THE SAME PHOSPHOR HOST MATERIAL, AND HEAT-TREATING THE LAYERS IN A REDUCING AND ACTIVATING ATMOSPHERE TO CAUSE THE ACTIVATION AND CRYSTALLIZATION OF THE SECOND LAYER.
Claim 2
Independent Claim
64 words
THE METHOD OF PREPARING A TRANSPARENT LUMINESCENT SCREEN WHICH METHOD COMPRISES THE STEPS OF VACUMN EVAPORATING UPON A TRANSPARENT SUBSTRATE A FIRST CRYSTALLINE LAYER OF PHOSPHOR HOST MATERIAL, VACUUM EVAPORATING UPON THE CRYSTALLINE LAYER A SECOND AMORPHOUS LAYER OF THE SAME PHOSPHOR HOST MATERIAL, AND HEAT-TREATING THE LAYERS IN A REDUCING AND ACTIVATING ATMOSPHERE TO CAUSE THE ACTIVATION AND CRYSTALLIZATION OF THE SECOND LAYER.
References Cited (Backward Citations)
US2732312A
Cited
US2659678A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-05 | 1962-07-07 | 1963-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-05 | 1966-07-07 | 1967-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-05 | 1970-07-07 | 1971-01-06 | $7700.00 | Window Closed / Lapsed |