Patent US3468992A successfully refreshed from Google Patents.
US3468992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing manufactured articles of silicon nitride,also in admixture with silicon carbide
Assignee: Montedison SpA
•
Filing: 1966-04-20
•
Granted: 1969-09-23
•
Expires: 1986-04-20
Abstract
No abstract record available.
Inventors
- 👤 Eugenio Lubatti
- 👤 Salvatore Pappalardo
- 👤 Ugo Mirarchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C01; C01B; C01B32/00; C01B32/90; C01B32/914; C01B32/956
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |