Patent US3216847A successfully refreshed from Google Patents.
US3216847A
Expired / Lapsed
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Frit compositions for vitreous enamels
Assignee: NL Industries Inc
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Filing: 1962-03-21
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Granted: 1965-11-09
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Expires: 1982-03-21
Abstract
No abstract record available.
Inventors
- 👤 David L Armant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:09
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A DURABLE, ADHERENT VITREOUS ENAMEL COATING ON A CAST IRON PRODUCT, SAID COATING CONSISTING OF THE FOLLOWING COMPOSITION: PERCENT NA2O 0 TO 15 K2O 5 TO 19 LI2O 0 TO 4 B2O3 10 TO 20 SIO 38 TO 48 TIO2 18 TO 28 AL2O3 0 TO 3 P2O5 0 TO 3 AS2O5 0 TO 3 METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF MGO AND ZNO 0 TO 3SP@ THE SUM OF THE ALKALI METAL OXIDES BEING FROM 12% TO 20% AND IN WHICH AT LEAST 1% IS AN ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O AND LI2O, THE SUM OF THE AL2O3+P2O5+AS2O5+METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF MGO AND ZNO BEING FROM 0% TO 9%, ALL OF THE PERCENTAGES EXPRESSED ON A WEIGHT BASIS, SAID COATING HAVING A CLEAN WHITE COLOR, GLOSSY APPEARANCE, A HIGH REFLECTANCE VALUE AND STAINLESS ACID RESISTANCE.
Claim 2
Dependent Claim
147 words
A DURABLE, ADHERENT VITREOUS ENAMEL COATING ON A CAST IRON PRODUCT, SAID COATING CONSISTING OF THE FOLLOWING COMPOSITION: PERCENT NA2O 0 TO 15 K2O 5 TO 19 LI2O 0 TO 4 B2O3 10 TO 20 SIO 38 TO 48 TIO2 18 TO 28 AL2O3 0 TO 3 P2O5 0 TO 3 AS2O5 0 TO 3 METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF MGO AND ZNO 0 TO 3SP@ THE SUM OF THE ALKALI METAL OXIDES BEING FROM 12% TO 20% AND IN WHICH AT LEAST 1% IS AN ALKALI METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF NA2O AND LI2O, THE SUM OF THE AL2O3+P2O5+AS2O5+METAL OXIDE SELECTED FROM THE GROUP CONSISTING OF MGO AND ZNO BEING FROM 0% TO 9%, ALL OF THE PERCENTAGES EXPRESSED ON A WEIGHT BASIS, SAID COATING HAVING A CLEAN WHITE COLOR, GLOSSY APPEARANCE, A HIGH REFLECTANCE VALUE AND STAINLESS ACID RESISTANCE.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-11-08 | 1969-05-10 | 1969-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-08 | 1973-05-10 | 1973-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-08 | 1977-05-10 | 1977-11-09 | $7700.00 | Window Closed / Lapsed |