Patent US3353950A successfully refreshed from Google Patents.
US3353950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of finely particulate high purity copper powder
Assignee: Duisburger Kupferhuette
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Filing: 1965-07-29
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Granted: 1967-11-21
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Expires: 1985-07-29
Abstract
No abstract record available.
Inventors
- 👤 Junghanss Helmut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:01
CPC Classifications
C; C22; C22B; C22B15/00; C22B15/0063; C22B15/0084; C22B15/0089; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
A PROCESS FOR THE PRODUCTION OF FINELY PARTICULATE, HIGH PURITY COPPER POWDER WHEREIN, (A) IN A FIRST STAGE, A SOLUTION CONTAINING BIVALENT COPPER AND CHLORIDE IONS IS REDUCED AND THE SO PRODUCED CUPROUS CHLORIDE IS PRECIPITATED AND SEPARATED, (B) IN A SECOND STAGE, AN AQUEOUS SUSPENSION OF CUPROUS CHLORIDE IS REACTED WITH A COMPOUND YIELDING HYDROXYL IONS AND THE SO PRODUCED CUPROUS OXIDE IS PRECIPITATED AND SEPARATED, (C) IN A THIRD STAGE THE CUPROUS OXIDE FROM THE SECOND STAGE IS DISPROPORTIONATED WITH AN OXY ACID TO GIVE COPPER POWDER AND THE CUPRIC SALT OF THE OXY ACID AND (D) IN A FOURTH STAGE THE CUPRIC SALT OF THE OXY ACID IS REACTED WITH A REDUCING AGENT AND A COMPOUND YIELDING CHLORIDE IONS, AND CUPROUS CHLORIDE IS PRECIPITATED AND RECYCLED TO THE SECOND STAGE.
Claim 2
Dependent Claim
133 words
A PROCESS FOR THE PRODUCTION OF FINELY PARTICULATE, HIGH PURITY COPPER POWDER WHEREIN, (A) IN A FIRST STAGE, A SOLUTION CONTAINING BIVALENT COPPER AND CHLORIDE IONS IS REDUCED AND THE SO PRODUCED CUPROUS CHLORIDE IS PRECIPITATED AND SEPARATED, (B) IN A SECOND STAGE, AN AQUEOUS SUSPENSION OF CUPROUS CHLORIDE IS REACTED WITH A COMPOUND YIELDING HYDROXYL IONS AND THE SO PRODUCED CUPROUS OXIDE IS PRECIPITATED AND SEPARATED, (C) IN A THIRD STAGE THE CUPROUS OXIDE FROM THE SECOND STAGE IS DISPROPORTIONATED WITH AN OXY ACID TO GIVE COPPER POWDER AND THE CUPRIC SALT OF THE OXY ACID AND (D) IN A FOURTH STAGE THE CUPRIC SALT OF THE OXY ACID IS REACTED WITH A REDUCING AGENT AND A COMPOUND YIELDING CHLORIDE IONS, AND CUPROUS CHLORIDE IS PRECIPITATED AND RECYCLED TO THE SECOND STAGE.
References Cited (Backward Citations)
DE1153907B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-11-20 | 1971-05-22 | 1971-11-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-11-20 | 1975-05-22 | 1975-11-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-11-20 | 1979-05-22 | 1979-11-21 | $7700.00 | Window Closed / Lapsed |