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US2576916A
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Frit compositions for vitreous enamels
Assignee: NL Industries Inc
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Filing: 1950-08-10
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Granted: 1951-12-04
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Expires: 1970-08-10
Abstract
No abstract record available.
Inventors
- 👤 Malcolm D Beals
- 👤 Laurence R Blair
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:03
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/12; C03C3/16; C03C3/19; C03C8/00; C03C8/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
A FRIT COMPOSITION CAPABLE OF FORMING A VITREOUS ENAMEL WHICH MATURES AT TEMPERATURES BETWEEN 650* C. AND 825* C. WHICH COMPRISES FROM 6% TO 12% TIO2, 18% TO 37% P2O5, 19% TO 39% AL2O3, 7% TO 37% B2O3, 14% TO 23% ALAKLI METAL OXIDE; THE SUM OF THE ALKALI METAL OXIDE AND THE P2O5 EQUAL TO 58% TO 8K% OF THE SUM OF THE ALKALI METAL OXIDE, THE P2O5 AND THE B2O3; WHEN THE B2O3 IS LESS THAN 22%, THE AL2O3 MUST BE AT LEAST 23%; WHEN THE B2O3 IS AT LEAST 22%, THE P2O5 MUST BE LESS THAN 31%; THE ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O AND NA2O IN COMBINATION WITH K2O AND LI2O; THE K2O IN AMOUNT TO REPLACE UP TO 60% OF THE NA2O; THE LI2O IN AMOUNT TO REPLACE UP TO 20% OF THE NA2O.
Claim 2
Dependent Claim
143 words
A FRIT COMPOSITION CAPABLE OF FORMING A VITREOUS ENAMEL WHICH MATURES AT TEMPERATURES BETWEEN 650* C. AND 825* C. WHICH COMPRISES FROM 6% TO 12% TIO2, 18% TO 37% P2O5, 19% TO 39% AL2O3, 7% TO 37% B2O3, 14% TO 23% ALAKLI METAL OXIDE; THE SUM OF THE ALKALI METAL OXIDE AND THE P2O5 EQUAL TO 58% TO 8K% OF THE SUM OF THE ALKALI METAL OXIDE, THE P2O5 AND THE B2O3; WHEN THE B2O3 IS LESS THAN 22%, THE AL2O3 MUST BE AT LEAST 23%; WHEN THE B2O3 IS AT LEAST 22%, THE P2O5 MUST BE LESS THAN 31%; THE ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O AND NA2O IN COMBINATION WITH K2O AND LI2O; THE K2O IN AMOUNT TO REPLACE UP TO 60% OF THE NA2O; THE LI2O IN AMOUNT TO REPLACE UP TO 20% OF THE NA2O.
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) | 1954-12-03 | 1955-06-04 | 1955-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-03 | 1959-06-04 | 1959-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-03 | 1963-06-04 | 1963-12-04 | $7700.00 | Window Closed / Lapsed |