US3334962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of cubic crystalline zirconia
Assignee: NL Industries Inc
•
Filing: 1962-10-08
•
Granted: 1967-08-08
•
Expires: 1982-10-08
Abstract
No abstract record available.
Inventors
- 👤 Clearfield Abraham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:01
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/02; C01P; C01P2002/00; C01P2002/70; C01P2002/72; C01P2002/74
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A PROCESS FOR PRODUCTING HYDROUS, CRYSTALLINE, CUBIC ZIRCONIA WHICH COMPRISES HEATING A SLURRY OF AMORPHOUS HYDROUS ZIRCONIA IN AN AQUEOUS SOLUTION OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES AND ALKALI METAL CARBONATES, SAID SLURRY HAVING A PH OF AT LEAST 9 AND THE TEMPERATURE HEINB AT LEAST 50* C., UNTIL SAID HYDROUS ZIRCONIA EXHIBITS A CRYSTAL STRUCTURE SUBSTANTIALLY IDENTICAL WITH THAT OF CUBIC ZIRCONIA, THE PERIOD OF HEATING VARYING INVERSELY WITH RESPECT TO TEMPERATURE AND PH, AND THEREAFTER SEPARATING SAID HYDROUS, CRYSTALLINE, CUBIC ZIRCONIA FROM SAID AQUEOUS SOLUTION.
Claim 2
Dependent Claim
93 words
A PROCESS FOR PRODUCTING HYDROUS, CRYSTALLINE, CUBIC ZIRCONIA WHICH COMPRISES HEATING A SLURRY OF AMORPHOUS HYDROUS ZIRCONIA IN AN AQUEOUS SOLUTION OF A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF ALKALI METAL HYDROXIDES AND ALKALI METAL CARBONATES, SAID SLURRY HAVING A PH OF AT LEAST 9 AND THE TEMPERATURE HEINB AT LEAST 50* C., UNTIL SAID HYDROUS ZIRCONIA EXHIBITS A CRYSTAL STRUCTURE SUBSTANTIALLY IDENTICAL WITH THAT OF CUBIC ZIRCONIA, THE PERIOD OF HEATING VARYING INVERSELY WITH RESPECT TO TEMPERATURE AND PH, AND THEREAFTER SEPARATING SAID HYDROUS, CRYSTALLINE, CUBIC ZIRCONIA FROM SAID AQUEOUS SOLUTION.
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) | 1970-08-07 | 1971-02-06 | 1971-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-08-07 | 1975-02-06 | 1975-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-08-07 | 1979-02-06 | 1979-08-08 | $7700.00 | Window Closed / Lapsed |