US3020619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Firing process for forsterite ceramics
Assignee: RCA Corp
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Filing: 1959-12-07
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Granted: 1962-02-13
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Expires: 1979-12-07
Abstract
No abstract record available.
Inventors
- 👤 William J Koch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:08
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
134 words
IN A METHOD OF MAKING CERAMIC PARTS OF APPROXIMATELY FORSTERITE COMPOSITION, HAVING RELATIVELY HIGH DENSITY AND HIGH MODULUS OF RUPTURE, THE PROCESS COMPRISING PREPARING A BLENDED AND DRIED MIXTURE OF TALC (3MGO.4SIO2.2H2O), FUSED MGO, POTASH FELDSPAR, BALL CLAY (AL2O3.SIO2.2H2O) AND PRECIPITATED BACO3, MIXING THE BLENDED MIXTURE WITH ORGANIC PLASTICIZERS, BINDERS AND LUBRICANTS TO PREPARE A MOLDING COMPOSITION, MOLDING PARTS OF SAID COMPOSITION, SUBSTANTIALLY ALL VOLATILE MATTER, A FIRST FIRING IN AIR TO BURN OFF SUBSTANTIALLY AL ORGANIC MATTER AND TO DRIVE OFF SUBSTANTIALLY ALL VOLATILE MATTER, AND THEN SUBJECTING SAID PARTS TO A SECOND FIRING FOR A RELATIVELY BRIEF PERIOD OF TIME IN A NON-OXIDIZING ATMOSPHERE UNTIL SAID PARTS ARE COMPLETELY VITRIFIED, SAID SECOND FIRING INCLUDING MAINTAINING SAID PARTS AT A MAXIMUM TEMPERATURE OF ABOUT 1375* TO 1390*C. FOR ABOUT 5 TO 10 MINUTES.
Claim 2
Dependent Claim
134 words
IN A METHOD OF MAKING CERAMIC PARTS OF APPROXIMATELY FORSTERITE COMPOSITION, HAVING RELATIVELY HIGH DENSITY AND HIGH MODULUS OF RUPTURE, THE PROCESS COMPRISING PREPARING A BLENDED AND DRIED MIXTURE OF TALC (3MGO.4SIO2.2H2O), FUSED MGO, POTASH FELDSPAR, BALL CLAY (AL2O3.SIO2.2H2O) AND PRECIPITATED BACO3, MIXING THE BLENDED MIXTURE WITH ORGANIC PLASTICIZERS, BINDERS AND LUBRICANTS TO PREPARE A MOLDING COMPOSITION, MOLDING PARTS OF SAID COMPOSITION, SUBSTANTIALLY ALL VOLATILE MATTER, A FIRST FIRING IN AIR TO BURN OFF SUBSTANTIALLY AL ORGANIC MATTER AND TO DRIVE OFF SUBSTANTIALLY ALL VOLATILE MATTER, AND THEN SUBJECTING SAID PARTS TO A SECOND FIRING FOR A RELATIVELY BRIEF PERIOD OF TIME IN A NON-OXIDIZING ATMOSPHERE UNTIL SAID PARTS ARE COMPLETELY VITRIFIED, SAID SECOND FIRING INCLUDING MAINTAINING SAID PARTS AT A MAXIMUM TEMPERATURE OF ABOUT 1375* TO 1390*C. FOR ABOUT 5 TO 10 MINUTES.
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) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |