US2753301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electropolishing of copper and its alloys
Assignee: Dow Chemical Co
•
Filing: 1952-01-11
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Granted: 1956-07-03
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Expires: 1972-01-11
Abstract
No abstract record available.
Inventors
- 👤 Frederick C Bersworth
- 👤 Richard F Atwood
- 👤 Newell J Bicknell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:52
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
THE METHOD OF ELECTROPOLISHING THE SURFACES OF ARTICLES COMPOSED OF COPPER AND COPPER BASE ALLOYS, WHICH COMPRISES MAKING THE ARTICLE AN ANODE IN AN AQUEOUS ELECTROLYTIC BATH CONSISTING ESSENTIALLY OF AN ALKALI METAL SALT OF AN ALYKLENE POLYAMINE CARBOXYLIC ACID, AN INORGANIC ACID IN AN AMOUNT ESTABLISHING A PH OF ABOUT 4 IN THE SAID AQUEOUS SOLUTION, AND A NON-ELECTROLYTE, AND PASSING AN ELECTRIC CURRENT THROUGH THE SOLUTION UNDER SUCH CONDITIONS OF CURRENT DENSITY, SOLUTION TEMPERATURE, TIME AND AGITATION, AS TO CLEAN AND POLISH THE SAID SURFACE ELECTROLYTICALLY AND TO COVER THE POLISHED SURFACE WITH A THIN POLARIZING OXIDE FILM LAYER TO IMPART CORROSION RESISTANCE TO THE POLISHED SURFACE.
Claim 2
Independent Claim
109 words
THE METHOD OF ELECTROPOLISHING THE SURFACES OF ARTICLES COMPOSED OF COPPER AND COPPER BASE ALLOYS, WHICH COMPRISES MAKING THE ARTICLE AN ANODE IN AN AQUEOUS ELECTROLYTIC BATH CONSISTING ESSENTIALLY OF AN ALKALI METAL SALT OF AN ALYKLENE POLYAMINE CARBOXYLIC ACID, AN INORGANIC ACID IN AN AMOUNT ESTABLISHING A PH OF ABOUT 4 IN THE SAID AQUEOUS SOLUTION, AND A NON-ELECTROLYTE, AND PASSING AN ELECTRIC CURRENT THROUGH THE SOLUTION UNDER SUCH CONDITIONS OF CURRENT DENSITY, SOLUTION TEMPERATURE, TIME AND AGITATION, AS TO CLEAN AND POLISH THE SAID SURFACE ELECTROLYTICALLY AND TO COVER THE POLISHED SURFACE WITH A THIN POLARIZING OXIDE FILM LAYER TO IMPART CORROSION RESISTANCE TO THE POLISHED SURFACE.
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) | 1959-07-03 | 1960-01-02 | 1960-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-07-03 | 1964-01-02 | 1964-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-07-03 | 1968-01-02 | 1968-07-03 | $7700.00 | Window Closed / Lapsed |