US3390959A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making alumina
Assignee: ChampionX LLC
•
Filing: 1965-04-30
•
Granted: 1968-07-02
•
Expires: 1985-04-30
Abstract
No abstract record available.
Inventors
- 👤 Frederick J Sibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:08
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/04; C01F7/06; C01F7/0646; C01F7/0653
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3127239A
Cited
US3194757A
Cited
US3276998A
Cited
US3023162A
Cited
US3085853A
Cited
US3142637A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |