Patent US3298781A successfully refreshed from Google Patents.
US3298781A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of sulfites from red mud
Assignee: Mitsubishi Engineering and Shipbuilding Co Ltd
•
Filing: 1963-02-05
•
Granted: 1967-01-17
•
Expires: 1983-02-05
Abstract
No abstract record available.
Inventors
- 👤 Fukuma Shinichi
- 👤 Atsukawa Masumi
- 👤 Nishimoto Yoshihiko
- 👤 Inoue Yoshiya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:56
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501; C; C01; C01B; C01B17/00; C01B17/62; C01D; C01D5/00; C01D5/14
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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |