US2861930A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of electropolishing and electrolytic solution therefor
Assignee: AO Smith Corp
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Filing: 1956-09-13
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Granted: 1958-11-25
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Expires: 1976-09-13
Abstract
No abstract record available.
Inventors
- 👤 Herbert B Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:12
CPC Classifications
C; C25; C25F; C25F3/00; C25F3/16; C25F3/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
135 words
THE METHOD OF ELECTROPOLISHING METALLIC MATERIAL SELECTED FROM THE GROUP CONSISTING OF THE 200 SERIES OF STAINLESS STEEL, THE 300 SERIES OF STAINLESS STEEL, THE 400 SERIES OF STAINLESS STEEL, CARBON STEEL, NICKEL AND NICKEL BASE ALLOYS, AND COBALT AND COBALT BASE ALLOYS WHICH COMPRISES PASSING AN ELECTRIC CURRENT FROM SAID METALLIC MATERIAL AS THE ANODE THROUGH AN AQUEOUS SOLUTION OF A MIXTURE OF ORTHO PHOSPHORIC ACID, A SALT OF OLGINIC ACID AND A MINERAL ACID SELECTED FROM THE GROUP CONSISTING OF SULPHURIC ACID AND HYDROCHLORIC ACID, SAID DERIVATIVE OF ALGINIC ACID BEING PRESENT IN AN AMOUNT OF ABOUT 0.1% TO 5.0% BY WEIGHT OF SAID SOLUTION, AND CONTINUING TO PASS SAID CURRENT WITH SUFFICIENT DENSITY FOR A SUFFICIENT LENGTH OF TIME TO REMOVE SCALE AND DISCOLORATION AND TO BRIGHTEN AND SMOOTH SAID METALLIC MATERIAL.
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) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |