Patent US2321113A successfully refreshed from Google Patents.
Patent US3669650A successfully refreshed from Google Patents.
US3669650A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of copper compounds and copper metal powder
Assignee: Individual
•
Filing: 1970-03-26
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Granted: 1972-06-13
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Expires: 1990-03-26
Abstract
Abstract THE PRESENT INVENTION RELATES TO A PROCESS FOR THE PRODUCTION OF COPPER COMPOUNDS FROM COPPER CEMENT, WHICH COMPRISES FIRST AT LEAST PARTIALLY OXIDIZING THE COPPER CEMENT AND AFTERWARDS REACTING THE OXIDIZED COPPER CEMENT WITH HYDROCHLORIC ACID. IF DESIRED, THE THUS OBTAINED CUPROUS CHLORIDE IS FURTHER REACTED SO AS TO CONVERT IT INTO OTHER COPPER COMPOUNDS. THE REACTION MAY BE CONDUCTED IN SUCH MATTER THAT PART OF THE COPPER CEMENT IS CONVERTED INTO HIGH GRADE COPPER METAL POWDER.
Inventors
- 👤 Benjamin Elstein
- 👤 Roman Fein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:50
CPC Classifications
C; C01; C01G; C01G3/00; C01G3/04; C01G3/05; C22; C22B; C22B15/00; C22B15/0063; 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) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |