US2882211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of mineral benefication
Assignee: Individual
•
Filing: 1953-10-12
•
Granted: 1959-04-14
•
Expires: 1973-10-12
Abstract
No abstract record available.
Inventors
- 👤 Evert A Autrey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:20
CPC Classifications
C; C01; C01F; C01F7/00; C01F7/02; C01F7/46; C04; C04B; C04B33/00; C04B33/02; C04B33/04; C04B33/06; C04B33/30
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
IN THE PRODUCTION OF CLAY HAVING A HIGH BRIGHTNESS VALUE FROM RAW CLAY STAINED WITH IRON OCIDES THE STEPS COMPRISING MIXING SAID CLAY WITH NOT LESS THAN ABOUT 0.1% AND NOT MORE THAN ABOUT 3% BY WEIGHT OF FINELY DIVIDED SULFUR, GRAINING THE RESULTING MIXTURE WITH THE ADDITION OF SUFFICIENT WATER TO FORM PELLETS PERMEABLE TO A GAS, IN TRODUCING SAID PETTETS INTO A REACTION CHAMBER TRANSPARENT TO LIGHT, HEATING SAID PELLETS TO A TEMPERATURE BETWEEN 90* AND 150* CENTIGRADE, PASSING GASEOUS CHLORINE THROUGH SAID REACTION CHAMBER EFFECTIVE TO CONTACT SAID PELLETS WHILE IRRADIATING SAID REACTION CHAMBER WITH LIGHT, SWEEPING OFF VOLATILE COMPOUNDS BY MEANS OF A STREAM OF EXCESS CHLORINE GAS, AND WASHING THE RESULTING PRODUCT WITH WATER TO REMOVE SOLUBLE COMPOUNDS.
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) | 1962-04-13 | 1962-10-13 | 1963-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-13 | 1966-10-13 | 1967-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-13 | 1970-10-13 | 1971-04-14 | $7700.00 | Window Closed / Lapsed |