Patent US3739061A successfully refreshed from Google Patents.
US3739061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of synthetic rutile
Assignee: United States Department of the Interior
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Filing: 1971-08-10
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Granted: 1973-06-12
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Expires: 1991-08-10
Abstract
Abstract SYNTHETIC RUTILE IS PRODUCED TITANIA SLAG BY OXIDIZING THE SLAG TO FROM RETILE IN MICROCRYSTALLINE FORM. THESE MICROCRYSTALS ARE THEN GRWN TO LARGER SIZED BY HEATING IN THE PRESENCE OF A FLUXING AGENT WHICH DISSOLVES METAL OXIDE IMPURTIES CONTAINED IN THE SLAG TO FORM A WADK AND FRIABLE GLASSY MATRIX. RUTILE CRYSTALS ARE FREED FROM THE MATRIX BY COMMINUTION AND A RUTILE PRODUCT FRACTIONS IS RECOVERED USING PHYSICAL OR CHEMICAL BENEFICIATION TECHNIQUES.
Inventors
- 👤 W Stickney
- 👤 W Hunter
- 👤 G Elger
- 👤 S Rhoads
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:41
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/10; C22B34/12; C22B34/1218; C22B34/1227; Y; Y02; Y02P; Y02P10/00; Y02P10/20
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) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |