Patent US6263497B1 successfully refreshed from Google Patents.
US3202589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electroplating
Assignee: Diamond Shamrock Corp
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Filing: 1963-09-12
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Granted: 1965-08-24
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Expires: 1983-09-12
Abstract
No abstract record available.
Inventors
- 👤 Bride John Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:31
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/34
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
148 words
THE METHOD OF ELECTROPOLISHING CAST ZINC BASE ARTICLES WHICH COMPRISES, SUBJECTING THE ARTICLE TO ELECTROPOLISHING IN AN ELECTROLYTIC CELL IN WHICH THE ARTICLE IS THE ANODE, THE ELECTROLYTE IS COMPRISED SUBSTANTIALLY OF AN AQUEOUS ALKALI METAL HYDROXIDE SOLUTION IN THE AMOUNT BETWEEN ABOUT 450 AND 900 GRAMS OF ALKALI METAL HYHDROXIDE, BETWEEN ABOUT 20 AND 100 GRAMS OF ZINC OXIDE AND THE TRIVALENT CHROMIC ION EQUIVALENT OF BETWEEN ABOUT 1.5 AND 3 GRAMS OF BASIC CHROMIC SULFATE PER LITER OF SOLUTION, MAINTAINED AT A TEMPERATURE BETWEEN ABOUT 60 AND 220*F., THE CATHODE IS A CONDUCTING MATERIAL, AND THE CURRENT PASSING BETWEEN THE ANODE AND THE CATHODE HAS A CURRENT DENSITY OF BETWEEN 50 AND 800 AMPERES PER SQUARE FOOT AND IS MAINTAINED AT A VOLTAGE OF ABOUT 8 FOR A PERIOD OF ABOUT 0.25 TO 8 MINUTES, TO POLISH THE ARTICLE AND CLEAR OUT ANY SURFACE PORES THEREIN.
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) | 1968-08-23 | 1969-02-22 | 1969-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-23 | 1973-02-22 | 1973-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-23 | 1977-02-22 | 1977-08-24 | $7700.00 | Window Closed / Lapsed |