Patent US3471306A successfully refreshed from Google Patents.
US3471306A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory resistant to molten aluminum
Assignee: NARCO INVESTORS Inc
•
Filing: 1968-07-16
•
Granted: 1969-10-07
•
Expires: 1988-07-16
Abstract
No abstract record available.
Inventors
- 👤 Jack Alvin Rubin
- 👤 Robert Anthony Gdula
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:57
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/22; C04B35/00; C04B35/01; C04B35/16; C04B35/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2997402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-10-06 | 1973-04-07 | 1973-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-10-06 | 1977-04-07 | 1977-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-10-06 | 1981-04-07 | 1981-10-07 | $7700.00 | Window Closed / Lapsed |