US2647841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of luminescent screens
Assignee: General Electric Co
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Filing: 1950-08-31
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Granted: 1953-08-04
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Expires: 1970-08-31
Abstract
No abstract record available.
Inventors
- 👤 Martin L Perl
- 👤 John R Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:47
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/20; H01J9/22; H01J9/221; H01J9/223
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
160 words
THE METHOD OF SETTLING A PHOSPHOR ONTO THE FACE OF A CATHODE RAY TUBE WHICH COMPRISES THE STEPS OF INTRODUCING INTO SAID TUBE A CUSHIONING LAYER COMPRISING A DILUTE SOLUTION OF A STRONG ACID IN AN AMOUNT SUFFICIENT TO COVER THE ENTIRE FACE OF SAID TUBE AND THEREAFTER ADDING TO THE CUSHIONING LAYER A SILICA SOL COMPOSED OF AN ALKALI SILICATE AND WATER AND HAVING A PHOSPHOR SUSPENDED THEREIN, THE SIO2 CONTENT OF THE RESULTANT MIXTURE BEING FROM 0.3 TO 1.0 PER CENT, BY WEIGHT, BASED ON THE WEIGHT OF THE RESULTANT MIXTURE, SAID ACID AND SAID SILICATE BEING PRESENT IN PROPORTIONS SUCH THAT THE PH OF THE RESULTANT MIXTURE IS FROM 6 TO 7.5 MAINTAINING THE TEMPERATURE OF THE RESULTANT MIXTURE FROM ABOUT 68* TO ABOUT 100* F. FOR A PERIOD SUFFICIENT TO ALLOW THE PHOSPHOR TO SETTLE ONTO AND ADHERE TO SAID FACE, AND THEREAFTER DRAINING SAID TUBE OF ANY REMAINING SUPERNATANT LIQUID AND DRYING THE SETTLED PHOSPHOR.
Claim 2
Independent Claim
160 words
THE METHOD OF SETTLING A PHOSPHOR ONTO THE FACE OF A CATHODE RAY TUBE WHICH COMPRISES THE STEPS OF INTRODUCING INTO SAID TUBE A CUSHIONING LAYER COMPRISING A DILUTE SOLUTION OF A STRONG ACID IN AN AMOUNT SUFFICIENT TO COVER THE ENTIRE FACE OF SAID TUBE AND THEREAFTER ADDING TO THE CUSHIONING LAYER A SILICA SOL COMPOSED OF AN ALKALI SILICATE AND WATER AND HAVING A PHOSPHOR SUSPENDED THEREIN, THE SIO2 CONTENT OF THE RESULTANT MIXTURE BEING FROM 0.3 TO 1.0 PER CENT, BY WEIGHT, BASED ON THE WEIGHT OF THE RESULTANT MIXTURE, SAID ACID AND SAID SILICATE BEING PRESENT IN PROPORTIONS SUCH THAT THE PH OF THE RESULTANT MIXTURE IS FROM 6 TO 7.5 MAINTAINING THE TEMPERATURE OF THE RESULTANT MIXTURE FROM ABOUT 68* TO ABOUT 100* F. FOR A PERIOD SUFFICIENT TO ALLOW THE PHOSPHOR TO SETTLE ONTO AND ADHERE TO SAID FACE, AND THEREAFTER DRAINING SAID TUBE OF ANY REMAINING SUPERNATANT LIQUID AND DRYING THE SETTLED PHOSPHOR.
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) | 1956-08-03 | 1957-02-02 | 1957-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-08-03 | 1961-02-02 | 1961-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-08-03 | 1965-02-02 | 1965-08-04 | $7700.00 | Window Closed / Lapsed |