US1785464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing pure alumina
Assignee: ZAIDAN HOJIN RIKAGAKU KENKYUJO
•
Filing: 1927-07-06
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Granted: 1930-12-16
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Expires: 1947-07-06
Abstract
No abstract record available.
Inventors
- 👤 Suzuki Tsuneo
- 👤 Tanaka Hiroshi
- 👤 Kurita Torao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:51
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/38; C01F7/46
Claims Analysis
Total Claims: 0
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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) | 1933-12-15 | 1934-06-16 | 1934-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1937-12-15 | 1938-06-16 | 1938-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1941-12-15 | 1942-06-16 | 1942-12-16 | $7700.00 | Window Closed / Lapsed |