Patent US2171536A successfully refreshed from Google Patents.
US2636892A
Expired / Lapsed
US
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Production of metal oxalates
Assignee: International Standard Electric Corp
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Filing: 1949-04-21
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Granted: 1953-04-28
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Expires: 1969-04-21
Abstract
No abstract record available.
Inventors
- 👤 Mayer Simon Ernest
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:39
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/22; C; C07; C07C; C07C51/00; C07C51/41; C07C51/412
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
PROCESS OF MAKING A FINELY DIVIDED METAL OXALATE WHICH COMPRISES THE STEP OF PRECIPITATING THE OXALATE OF THE METAL BY MEANS OF OXALIC ACID AT A TEMPERATURE BETWEEN 40* C. AND 90* C. FROM A SOLUTION OF THE METAL SULPHATE IN THE PRESENCE OF A MILD ORGANIC REDUCING AGENT AND OF SULPHURIC ACID SUFFICIENT TO BRING THE PH OF THE SOLUTION TO A VALUE NOT EXCEEDING 3.
Claim 2
Dependent Claim
67 words
PROCESS OF MAKING A FINELY DIVIDED METAL OXALATE WHICH COMPRISES THE STEP OF PRECIPITATING THE OXALATE OF THE METAL BY MEANS OF OXALIC ACID AT A TEMPERATURE BETWEEN 40* C. AND 90* C. FROM A SOLUTION OF THE METAL SULPHATE IN THE PRESENCE OF A MILD ORGANIC REDUCING AGENT AND OF SULPHURIC ACID SUFFICIENT TO BRING THE PH OF THE SOLUTION TO A VALUE NOT EXCEEDING 3.
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) | 1956-04-27 | 1956-10-27 | 1957-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-04-27 | 1960-10-27 | 1961-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-04-27 | 1964-10-27 | 1965-04-28 | $7700.00 | Window Closed / Lapsed |