US2574065A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of chromic oxide
Assignee: Individual
•
Filing: 1946-09-11
•
Granted: 1951-11-06
•
Expires: 1966-09-11
Abstract
No abstract record available.
Inventors
- 👤 Schulein Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:33
CPC Classifications
C; C01; C01G; C01G37/00; C01G37/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A METHOD OF PRODUCING CHROMIC OXIDE WHICH INCLUDES ELECTROLYZING AN AQUEOUS SOLUTION OF A CHROMATE SALT OF AN ALKALI METAL SO AS TO PRODUCE AN ANOLYTE SOLUTION CONSISTING SUBSTANTIALLY OF CHROMIC ACID, PARTIALLY REDUCING SAID ANOLYTE SOLUTION TO FORM CHROMIUM DICHROMATE THEREBY RAISING THE PH OF SAID SOLUTION TO A VALUE ABOVE ABOUT PH 4.5 TO PRECIPITATE SAID CHROMIUM DICHROMATE, SEPARATING SAID PRECIPITATE FROM SAID SOLUTION AND THERMALLY DECOMPOSING SAID CHROMIUM DICHROMATE TO PRODUCE CHROMIC OXIDE.
Claim 2
Independent Claim
76 words
A METHOD OF PRODUCING CHROMIC OXIDE WHICH INCLUDES ELECTROLYZING AN AQUEOUS SOLUTION OF A CHROMATE SALT OF AN ALKALI METAL SO AS TO PRODUCE AN ANOLYTE SOLUTION CONSISTING SUBSTANTIALLY OF CHROMIC ACID, PARTIALLY REDUCING SAID ANOLYTE SOLUTION TO FORM CHROMIUM DICHROMATE THEREBY RAISING THE PH OF SAID SOLUTION TO A VALUE ABOVE ABOUT PH 4.5 TO PRECIPITATE SAID CHROMIUM DICHROMATE, SEPARATING SAID PRECIPITATE FROM SAID SOLUTION AND THERMALLY DECOMPOSING SAID CHROMIUM DICHROMATE TO PRODUCE CHROMIC OXIDE.
References Cited (Backward Citations)
US2099658A
Cited
US2416551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-11-05 | 1955-05-07 | 1955-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-11-05 | 1959-05-07 | 1959-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-11-05 | 1963-05-07 | 1963-11-06 | $7700.00 | Window Closed / Lapsed |