US3175919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zirconia refractory
Assignee: Harbison Walker Refractories Co
•
Filing: 1962-06-06
•
Granted: 1965-03-30
•
Expires: 1982-06-06
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Smoot
- 👤 Joseph R Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:40
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
A REFRACTORY BATCH CONSISTING ESSENTIALLY OF A MIXTURE OF TWO INGREDIENTS, THESE TWO INGREDIENTS BEING PARTIALLY STABILIZED ZIRCONIA GRAIN WHICH IS 75$10% STABILIZED AND GRAIN WHICH IS COMPLETELY STABILIZED ZIRCONIA, THE COMPLETELY STABILIZED ZIRCONIA GRAIN BEING FINER THAN THE PARTIALLY STABILIZED ZIRCONIA GRAIN, THERE BEING SUFFICIENT OF SAID COMPLETELY STABILIZED ZIRCONIA GRAIN TO SERVE AS A RIGID, DIMENSIONALLY STABLE MATRIX UPON FORMING AND FIRING OF THE BATCH, WHICH MATRIX SUBSTANTIALLY ENTIRELY ENCOMPASSES THE SEPARATE GRAIN PARTICLES OF THE PARTIALLY STABILIZED ZIRCONIA TO THEREBY PROVIDE A DIMENSIONALLY-STABLE REFRACTORY SHAPE ON FIRING, THE PARTIALLY STABILIZED GRAIN CONSTITUTING AT LEAST ABOUT THE MAJOR WEIGHT PORTION OF THE BATCH.
Claim 2
Dependent Claim
105 words
A REFRACTORY BATCH CONSISTING ESSENTIALLY OF A MIXTURE OF TWO INGREDIENTS, THESE TWO INGREDIENTS BEING PARTIALLY STABILIZED ZIRCONIA GRAIN WHICH IS 75$10% STABILIZED AND GRAIN WHICH IS COMPLETELY STABILIZED ZIRCONIA, THE COMPLETELY STABILIZED ZIRCONIA GRAIN BEING FINER THAN THE PARTIALLY STABILIZED ZIRCONIA GRAIN, THERE BEING SUFFICIENT OF SAID COMPLETELY STABILIZED ZIRCONIA GRAIN TO SERVE AS A RIGID, DIMENSIONALLY STABLE MATRIX UPON FORMING AND FIRING OF THE BATCH, WHICH MATRIX SUBSTANTIALLY ENTIRELY ENCOMPASSES THE SEPARATE GRAIN PARTICLES OF THE PARTIALLY STABILIZED ZIRCONIA TO THEREBY PROVIDE A DIMENSIONALLY-STABLE REFRACTORY SHAPE ON FIRING, THE PARTIALLY STABILIZED GRAIN CONSTITUTING AT LEAST ABOUT THE MAJOR WEIGHT PORTION OF THE BATCH.
References Cited (Backward Citations)
US2567592A
Cited
US2937102A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-03-29 | 1968-09-28 | 1969-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-03-29 | 1972-09-28 | 1973-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-03-29 | 1976-09-28 | 1977-03-30 | $7700.00 | Window Closed / Lapsed |