US2771375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-like composition and method for making the same
Assignee: NL Industries Inc
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Filing: 1952-08-26
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Granted: 1956-11-20
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Expires: 1972-08-26
Abstract
No abstract record available.
Inventors
- 👤 Robert W Foraker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:57
CPC Classifications
C; C03; C03C; C03C4/00; C03C2204/00; C03C2204/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
IN A TIO2 OPACIFIED VITREOUS ENAMEL COMPOSITION PREPARED BY MATURING A MIXTURE OF A FRIT COMPOSITION AND TIO2 AS AN OPACIFYING AGENT, SAID FRIT COMPOSITION CONTAINING FROM 45 TO 65 PERCENT PBO, FROM 20 TO 40 PERCENT SIO2, FROM 1 TO 8 PERCENT ALKALI SELECTED FROM THE GROUP CONSISTING OF LI2O, NA2O, K2O AND MIXTURES THEREOF, FROM 0 TO 8 PERCENT B2O3, AND FROM 0 TO 9 PERCENT DISSOLVED TIO2, ALL OF THE PERCENTAGES BEING WEIGHT PERCENTS, THE IMPROVEMENT WHICH CONSISTS IN HAVING BY WEIGHT IN SAID FRIT COMPOSITION FROM 0.01 TO 0.1 PART BY WEIGHT OF P2O5 FOR EACH PART OF PBO CONTAINED THEREIN.
Claim 2
Dependent Claim
105 words
IN A TIO2 OPACIFIED VITREOUS ENAMEL COMPOSITION PREPARED BY MATURING A MIXTURE OF A FRIT COMPOSITION AND TIO2 AS AN OPACIFYING AGENT, SAID FRIT COMPOSITION CONTAINING FROM 45 TO 65 PERCENT PBO, FROM 20 TO 40 PERCENT SIO2, FROM 1 TO 8 PERCENT ALKALI SELECTED FROM THE GROUP CONSISTING OF LI2O, NA2O, K2O AND MIXTURES THEREOF, FROM 0 TO 8 PERCENT B2O3, AND FROM 0 TO 9 PERCENT DISSOLVED TIO2, ALL OF THE PERCENTAGES BEING WEIGHT PERCENTS, THE IMPROVEMENT WHICH CONSISTS IN HAVING BY WEIGHT IN SAID FRIT COMPOSITION FROM 0.01 TO 0.1 PART BY WEIGHT OF P2O5 FOR EACH PART OF PBO CONTAINED THEREIN.
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) | 1959-11-20 | 1960-05-21 | 1960-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-11-20 | 1964-05-21 | 1964-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-11-20 | 1968-05-21 | 1968-11-20 | $7700.00 | Window Closed / Lapsed |