Patent US2996369A successfully refreshed from Google Patents.
US2996369A
Expired / Lapsed
US
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Zirconium oxide and process of making the same
Assignee: Titanium Zirconium Co Inc
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Filing: 1958-10-10
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Granted: 1961-08-15
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Expires: 1978-10-10
Abstract
No abstract record available.
Inventors
- 👤 William M Harris
- 👤 Robert H Linnell
- 👤 William F Meredith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:18
CPC Classifications
C; C01; C01G; C01G25/00; C01G25/02; C01P; C01P2002/00; C01P2002/70; C01P2004/00; C01P2004/60; C01P2004/61; C01P2006/00; C01P2006/60; C01P2006/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
57 words
CUBIC ZIRCONIUM OXIDE CONSISTING ESSENTIALLY OF ZIRCONIUM OXIDE AND SILICA, STABLE AT ROOM TEMPERATURE AND UNSTABLE AT 1200* C. AND ABOVE, BEING CONVERTIBLE TO MONOCLINIC ZIRCONIUM OXIDE BY HEATING AT 1200* C. FOR TWO HOURS AND THEN COOLING TO ROOM TEMPERATURE, THE SILICA BEING IN A PROPORTION TO FORM CUBIC ZIRCONIUM OXIDE USEFUL AS A GLASS POLISH.
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) | 1964-08-14 | 1965-02-13 | 1965-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-14 | 1969-02-13 | 1969-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-14 | 1973-02-13 | 1973-08-15 | $7700.00 | Window Closed / Lapsed |