US2948992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass compositions and glass-to-metal seals
Assignee: The General Electric Company PLC
•
Filing: 1958-02-21
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Granted: 1960-08-16
•
Expires: 1978-02-21
Abstract
No abstract record available.
Inventors
- 👤 Oldfield Lucy Florence
- 👤 Partridge Ethel
- 👤 Partridge Michael John Anthony
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:56
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/076; C03C3/11; C03C3/112; C03C27/00; C03C27/02; C03C27/04; C03C27/042; C03C27/046; C03C3/083; C03C3/085; C03C3/087; C03C3/115; C03C3/118
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
A GLASS FOR SEALING TO NICKEL AND TO METALS AND ALLOYS HAVING THERMAL EXPANSION CHARACTERISTICS SUCH THAT THE MEAN COEFFICIENTS OF THERMAL EXPANSION OVER THE TEMPERATURE RANGES OF 20*C. TO 450*C. AND 20* TO 500* C. DO NOT DIFFER FROM THOSE OF NICKEL OVER THE SAME TEMPERATURE RANGES BY MORE THAN 0.5X10-6 CM./CM./* C., WHICH HAS A COMPOSITION, BY WEIGHT, IN THE RANGE OF 45% TO 50% SILICA (SIO2), 12% TO 22% SODIUM OXIDE (NA2O), 0 TO 10% POTASSIUM OXIDE (K2O), 20% TO 30% ALKALINE EARTH METAL OXIDES (BAO+SRO+CAO) INCLUDING ONLY 0 TO 5% CALCIUM OXIDE, 0 TO 2% FLUORINE (F2), 0 TO 2% ALUMINA (AL2O3), 0.5% TO 10% ZINC OXIDE (ZNO), AND 0.5% TO 3% OF ONE OF THE OXIDES SELECTED FROM THE GROUP CONSISTING OF ZIRCONIA (ZRO2) AND TITANIA (TIO2), THE TOTAL CONTENT OF ALKALI METAL OXIDES (NA2O+K2O) BEING IN THE RANGE OF 18% TO 22%
Claim 2
Dependent Claim
148 words
A GLASS FOR SEALING TO NICKEL AND TO METALS AND ALLOYS HAVING THERMAL EXPANSION CHARACTERISTICS SUCH THAT THE MEAN COEFFICIENTS OF THERMAL EXPANSION OVER THE TEMPERATURE RANGES OF 20*C. TO 450*C. AND 20* TO 500* C. DO NOT DIFFER FROM THOSE OF NICKEL OVER THE SAME TEMPERATURE RANGES BY MORE THAN 0.5X10-6 CM./CM./* C., WHICH HAS A COMPOSITION, BY WEIGHT, IN THE RANGE OF 45% TO 50% SILICA (SIO2), 12% TO 22% SODIUM OXIDE (NA2O), 0 TO 10% POTASSIUM OXIDE (K2O), 20% TO 30% ALKALINE EARTH METAL OXIDES (BAO+SRO+CAO) INCLUDING ONLY 0 TO 5% CALCIUM OXIDE, 0 TO 2% FLUORINE (F2), 0 TO 2% ALUMINA (AL2O3), 0.5% TO 10% ZINC OXIDE (ZNO), AND 0.5% TO 3% OF ONE OF THE OXIDES SELECTED FROM THE GROUP CONSISTING OF ZIRCONIA (ZRO2) AND TITANIA (TIO2), THE TOTAL CONTENT OF ALKALI METAL OXIDES (NA2O+K2O) BEING IN THE RANGE OF 18% TO 22%
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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) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |