Patent US2441856A successfully refreshed from Google Patents.
US2441856A
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US
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Cyclical process for the manufacture of titanium dioxide
Assignee: NL Industries Inc
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Filing: 1942-08-01
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Granted: 1948-05-18
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Expires: 1962-08-01
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Turner
- 👤 Walter W Plechner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:58
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1236; C22B34/1259; C22B1/00; C22B1/02; C22B1/08; C22B34/1204; C22B34/1209; C22B34/1218; C22B34/1222; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1325561A
Cited
US1528319A
Cited
US1899573A
Cited
US1899574A
Cited
US2062133A
Cited
GB421308A
Cited
US2287082A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-05-18 | 1951-11-17 | 1952-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-05-18 | 1955-11-17 | 1956-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-05-18 | 1959-11-17 | 1960-05-18 | $7700.00 | Window Closed / Lapsed |