US2930713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vitreous enamel frit
Assignee: EIDP Inc
•
Filing: 1959-02-05
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Granted: 1960-03-29
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Expires: 1979-02-05
Abstract
No abstract record available.
Inventors
- 👤 Lewis C Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:41
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/089
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
THE METHOD OF ENAMELLING IRON OR STEEL WHICH COMPRISES APPLYING TO SAID METAL SURFACE A GROUND COAT FRIT, MATURING BETWEEN 490*C. AND 690*C. HAVING THE FOLLOWING COMPOSITION: MOL PERCENT SIO2 27-30 B2O3 22-28 TIO2 7-12 NA2O 16-23 K2O 0.5-3.0 LI2O 5-12 BAO 0-4 SB2O3 0-1 C0O 0-2 NIO 0-1 MNO2 0-1 PHO 0-2 F2 0-5 IN WHICH THE RATIO
Claim 2
Independent Claim
59 words
THE METHOD OF ENAMELLING IRON OR STEEL WHICH COMPRISES APPLYING TO SAID METAL SURFACE A GROUND COAT FRIT, MATURING BETWEEN 490*C. AND 690*C. HAVING THE FOLLOWING COMPOSITION: MOL PERCENT SIO2 27-30 B2O3 22-28 TIO2 7-12 NA2O 16-23 K2O 0.5-3.0 LI2O 5-12 BAO 0-4 SB2O3 0-1 C0O 0-2 NIO 0-1 MNO2 0-1 PHO 0-2 F2 0-5 IN WHICH THE RATIO
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) | 1963-03-29 | 1963-09-28 | 1964-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-03-29 | 1967-09-28 | 1968-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-03-29 | 1971-09-28 | 1972-03-29 | $7700.00 | Window Closed / Lapsed |