US3222148A
Expired / Lapsed
US
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Tetragonal zirconium oxide containing calcium oxide
Assignee: Harshaw Chemical Co
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Filing: 1963-03-15
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Granted: 1965-12-07
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Expires: 1983-03-15
Abstract
No abstract record available.
Inventors
- 👤 John O Hay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:29
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/14; C01; C01G; C01G25/00; C01G25/02; C09K3/1454; C09K3/1463; C01P; C01P2002/00; C01P2002/70; C01P2002/72
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
40 words
TETRAGONAL ZIRCONIUM OXIDE CONSISTING ESSENTIALLY OF ZIRCONIUM OXIDE AND CALCIA, SAID TETRAGONAL ZIRCONIUM OXIDE BEING STABLE AT ALL TEMPERATURES FROM ROOM TEMPERATURE TO ABOUT 1150*C., THE CALCIA BEING PRESENT IS A PROPORTION OF 0.5% BY WEIGHT OF THE ZIRCONIUM OXIDE.
Claim 2
Dependent Claim
40 words
TETRAGONAL ZIRCONIUM OXIDE CONSISTING ESSENTIALLY OF ZIRCONIUM OXIDE AND CALCIA, SAID TETRAGONAL ZIRCONIUM OXIDE BEING STABLE AT ALL TEMPERATURES FROM ROOM TEMPERATURE TO ABOUT 1150*C., THE CALCIA BEING PRESENT IS A PROPORTION OF 0.5% BY WEIGHT OF THE ZIRCONIUM OXIDE.
Claim 3
Dependent Claim
43 words
A GLASS POLISHING COMPOSITION CONSISTING ESSENTIALLY OF A MAJOR AMOUNT OF WATER AND A MINOR AMOUNT OF THE COMPOSITION OF MATTER DEFINED IN CLAIM 1, THE ZIRCONIA CONBY WEIGHT AND THE WATER CONTENT OF SUCH COMPOSITION BEING FROM 90% TO 40% BY WEIGHT.
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |