US2924533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spheroidal refractory material and method of making
Assignee: Unifrax I LLC
•
Filing: 1956-05-28
•
Granted: 1960-02-09
•
Expires: 1976-05-28
Abstract
No abstract record available.
Inventors
- 👤 John C Mcmullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:13
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/484
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
45 words
FUSED SPHERODIAL PARTICLES OF 8 MESH SIZE AND FINER CONSISTING ESSENTIALLY OF ZIRCONIA, ALUMINA AND SILICA IN THE PROPORTIONS BY WEIGHT OF 22.5% TO 75% ZIRCONIA, 25% TO 55% SILICA AND 0 TO 22.5% ALUMINA, SAID PARTICLES BEING IDIVIDUALLY SUBSTANTIALLY SOLID THROUGHOUT AND MECHANICALLY STRONG.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-02-08 | 1963-08-10 | 1964-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-02-08 | 1967-08-10 | 1968-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-02-08 | 1971-08-10 | 1972-02-09 | $7700.00 | Window Closed / Lapsed |