Patent US2733129A successfully refreshed from Google Patents.
US2733129A
Expired / Lapsed
US
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Copper hemicbromite and its preparation
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
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Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:36
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
58 words
PROCESS FOR PREPARING COPPER HEMICHROMITE WHICH COMPRISES DISSOLVING IN AQUEOUS SOLUTION ESSENTIALLY EQUIMOLAR PROPORTIONS OF A COPPER CARBOXYLATE AND CHRONIUM TRIOXIDE, DRYING AND CALCINING THE PRECIPITATED PRODUCT AT A TEMPERATURE OF 400* TO 475* C., THEN REDUCING IN HYDROGEN SAID CALCINED PRODUCT AT A TEMPERATURE OF 425* TO 475* C., AND OBTAINING AS THE RESULTING PRODUCT COPPER HEMICHROMITE.
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) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |