Patent US3060040A successfully refreshed from Google Patents.
US3060040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Forsterite-spinel ceramic bodies
Assignee: General Electric Co
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Filing: 1959-08-04
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Granted: 1962-10-23
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Expires: 1979-08-04
Abstract
No abstract record available.
Inventors
- 👤 Robert H Bristow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/20; C04B35/18; C04B35/195
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A SPINEL-FORSTERITE CERAMIC BODY CONSISTING ESSENTIALLY OF A REACTION PRODUCT OF ABOUT 31 TO 53.5 WEIGHT PERCENT MGO, ABOUT 7.7 TO 54 WEIGHT PERCENT AL2O3, ABOUT 9.7 TO 40.6 WEIGHT PERCENT SIO2 AND IN EXCESS OF 1 AND UP TO ABOUT 3 WEIGHT PERCENT BAO WITH SUBSTANTIALLY LESS THAN 1 WEIGHT PERCENT OF IMPURITIES, SAID BODY BEING VITRIFIED TO THE EXTENT THAT IT IS VACUUM TIGHT AND FREE FROM CONTINUOUS PORPOSITY AND NOT TO THE EXTEND THAT SURFACE DEFECTS ARE PRODUCED, SAID BODY CONTAINING CRYSTALLINE SPINEL, FORSTERITE AND A BAO-MODIFIED MAGNESIUM ALUMINOSILICATE GLASS AS ESSENTIAL CONSTITUENTS, SAID GLASS HAVING A COEFFICIENT OF THERMAL EXPANSION APPROACHING THOSE OF SAID SPINEL AND FORSTERITE, AND SAID BODY BEING SUBSTANTIALLY FREE OF NON-EQUILIBRUM PHASE AT THE MATURING TEMPERATURE AND UNREACTED OXIDES AT LOWER TEMPERATURES.
Claim 2
Dependent Claim
130 words
A SPINEL-FORSTERITE CERAMIC BODY CONSISTING ESSENTIALLY OF A REACTION PRODUCT OF ABOUT 31 TO 53.5 WEIGHT PERCENT MGO, ABOUT 7.7 TO 54 WEIGHT PERCENT AL2O3, ABOUT 9.7 TO 40.6 WEIGHT PERCENT SIO2 AND IN EXCESS OF 1 AND UP TO ABOUT 3 WEIGHT PERCENT BAO WITH SUBSTANTIALLY LESS THAN 1 WEIGHT PERCENT OF IMPURITIES, SAID BODY BEING VITRIFIED TO THE EXTENT THAT IT IS VACUUM TIGHT AND FREE FROM CONTINUOUS PORPOSITY AND NOT TO THE EXTEND THAT SURFACE DEFECTS ARE PRODUCED, SAID BODY CONTAINING CRYSTALLINE SPINEL, FORSTERITE AND A BAO-MODIFIED MAGNESIUM ALUMINOSILICATE GLASS AS ESSENTIAL CONSTITUENTS, SAID GLASS HAVING A COEFFICIENT OF THERMAL EXPANSION APPROACHING THOSE OF SAID SPINEL AND FORSTERITE, AND SAID BODY BEING SUBSTANTIALLY FREE OF NON-EQUILIBRUM PHASE AT THE MATURING TEMPERATURE AND UNREACTED OXIDES AT LOWER TEMPERATURES.
References Cited (Backward Citations)
US2227770A
Cited
US2962136A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-22 | 1966-04-23 | 1966-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-22 | 1970-04-23 | 1970-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-22 | 1974-04-23 | 1974-10-23 | $7700.00 | Window Closed / Lapsed |