Patent US3597247A successfully refreshed from Google Patents.
US3597247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina refractories
Assignee: Dresser Industries Inc
•
Filing: 1970-03-03
•
Granted: 1971-08-03
•
Expires: 1990-03-03
Abstract
Abstract FIRED REFRACTORY COMPRISING TIO2, ZRO2 AND THE REMAINDER AL2O3.
Inventors
- 👤 Daniel E Reardon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:50
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/48; C04B35/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |