US2537955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enamel opacifier and method of use
Assignee: NL Industries Inc
•
Filing: 1946-12-14
•
Granted: 1951-01-16
•
Expires: 1966-12-14
Abstract
No abstract record available.
Inventors
- 👤 William J Baldwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:29
CPC Classifications
C; C03; C03C; C03C1/00; C03C1/04; C03C8/00; C03C8/14; C03C8/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
THE METHOD OF INCREASING THE OPACITY OF AN ENAMEL FRIT COMPOSITION OF THE ZIRCONIUM OPACIFIED TYPE WHEREIN THE OPACITY IS DEVELOPED IN THE ENAMELING CYCLE WHICH COMPRISES ADDING TO THE ENAMEL AS A MILL ADDITION OPACIFIER 2 TO 4% BY WEIGHT OF A FINELY GROUND CALCINED MATERIAL CONTAINING 50 TO 75% ALUMINUM OXIDE AND 50 TO 25% PHOSPHORUS PENTOXIDE AS THE ESSENTIAL INGREDIENTS.
Claim 2
Independent Claim
63 words
THE METHOD OF INCREASING THE OPACITY OF AN ENAMEL FRIT COMPOSITION OF THE ZIRCONIUM OPACIFIED TYPE WHEREIN THE OPACITY IS DEVELOPED IN THE ENAMELING CYCLE WHICH COMPRISES ADDING TO THE ENAMEL AS A MILL ADDITION OPACIFIER 2 TO 4% BY WEIGHT OF A FINELY GROUND CALCINED MATERIAL CONTAINING 50 TO 75% ALUMINUM OXIDE AND 50 TO 25% PHOSPHORUS PENTOXIDE AS THE ESSENTIAL INGREDIENTS.
References Cited (Backward Citations)
US1654404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-15 | 1954-07-17 | 1955-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-15 | 1958-07-17 | 1959-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-15 | 1962-07-17 | 1963-01-16 | $7700.00 | Window Closed / Lapsed |