Patent FR1516205A successfully refreshed from Google Patents.
US3397950A
Expired / Lapsed
US
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Process for preparing solutions for television screens
Assignee: PQ Corp
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Filing: 1965-03-08
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Granted: 1968-08-20
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Expires: 1985-03-08
Abstract
No abstract record available.
Inventors
- 👤 Schnurch Roland
- 👤 Koster Alfred
- 👤 Helmut V Freyhold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:49
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/08; C09K11/59; C01; C01B; C01B33/00; C01B33/20; C01B33/32; C01B33/325; H; H01; H01J; H01J29/00; H01J29/02; H01J29/10; H01J29/18; H01J29/22; H01J9/00; H01J9/20; H01J9/22; H01J9/221; H01J9/223
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A PROCESS FOR THE PREPARATION OF A POTASSIUM SILICATE SOLUTION THAT IS ESPECIALLY USEFUL AS A COATING COMPONENT FOR TELEVISION SCREENS WHICH COMPRISES THE STEPS OF: (A) OBTAINING A SOLID POTASSIUM SILICATE HAVING A SIO2:K2O MOL RATIO BETWEEN ABOUT 4.0:1 AND 4.3:1, (B) ADMIXING SAID POTASSIUM SILICATE WITH WATER, (C) HEATING THE POTASSIUM SILICATE AND WATER ABOVE ABOUT 90*C., (D) ADDING SUFFICIENT POTASSIUM HYDROXIDE TO BRING THE SIO2:K2O MOL RATIO RATIO WITHIN THE RANGE OF 3.0:1 AND 4.0 TO 1. (E) MAINTAINING SUFFICIENT WATER IN THE AQUEOUS POTASSIUM SILICATE SO THAT THE CONCENTRATION DOES NOT EXCEED 165 GRAMS OF SIO2 PER LITER OF SOLUTION, (F) RECOVERING A TREATED POTASSIUM SILICATE, (G) SAID MOL RATIO AND SAID CONCENTRATION BEING CORRELATED SO THAT OPERATIONS ARE ABOVE THE CURVE IN FIGURE 2.
Claim 2
Dependent Claim
129 words
A PROCESS FOR THE PREPARATION OF A POTASSIUM SILICATE SOLUTION THAT IS ESPECIALLY USEFUL AS A COATING COMPONENT FOR TELEVISION SCREENS WHICH COMPRISES THE STEPS OF: (A) OBTAINING A SOLID POTASSIUM SILICATE HAVING A SIO2:K2O MOL RATIO BETWEEN ABOUT 4.0:1 AND 4.3:1, (B) ADMIXING SAID POTASSIUM SILICATE WITH WATER, (C) HEATING THE POTASSIUM SILICATE AND WATER ABOVE ABOUT 90*C., (D) ADDING SUFFICIENT POTASSIUM HYDROXIDE TO BRING THE SIO2:K2O MOL RATIO RATIO WITHIN THE RANGE OF 3.0:1 AND 4.0 TO 1. (E) MAINTAINING SUFFICIENT WATER IN THE AQUEOUS POTASSIUM SILICATE SO THAT THE CONCENTRATION DOES NOT EXCEED 165 GRAMS OF SIO2 PER LITER OF SOLUTION, (F) RECOVERING A TREATED POTASSIUM SILICATE, (G) SAID MOL RATIO AND SAID CONCENTRATION BEING CORRELATED SO THAT OPERATIONS ARE ABOVE THE CURVE IN FIGURE 2.
References Cited (Backward Citations)
US2784060A
Cited
US3077389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-20 | 1972-02-19 | 1972-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-20 | 1976-02-19 | 1976-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-20 | 1980-02-19 | 1980-08-20 | $7700.00 | Window Closed / Lapsed |