US3303032A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesia-zircon refractories
Assignee: Valley Dolomite Corp
•
Filing: 1964-05-27
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Granted: 1967-02-07
•
Expires: 1984-05-27
Abstract
No abstract record available.
Inventors
- 👤 John P Holt
- 👤 Cash Theodore Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
44 words
A REFRACTORY COMPOSITION CONSISTING ESSENTIALLY OF (A) FROM ABOUT 40% TO ABOUT 90% BASIC REFRACTORY COMPONENT OF GRAIN SIZE FROM ABOUT U.S. 70 MESH TO ABOUT 1 INCH, AND (B) FROM ABOUT 60% TO ABOUT 10% ZIRCON OF GRAIN SIZE SMALLER THAN 50 MESH.
Claim 2
Dependent Claim
44 words
A REFRACTORY COMPOSITION CONSISTING ESSENTIALLY OF (A) FROM ABOUT 40% TO ABOUT 90% BASIC REFRACTORY COMPONENT OF GRAIN SIZE FROM ABOUT U.S. 70 MESH TO ABOUT 1 INCH, AND (B) FROM ABOUT 60% TO ABOUT 10% ZIRCON OF GRAIN SIZE SMALLER THAN 50 MESH.
References Cited (Backward Citations)
US3044889A
Cited
US3192059A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-06 | 1970-08-08 | 1971-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-06 | 1974-08-08 | 1975-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-06 | 1978-08-08 | 1979-02-07 | $7700.00 | Window Closed / Lapsed |