Patent US3591398A successfully refreshed from Google Patents.
Patent US3043758A successfully refreshed from Google Patents.
US3043758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of electrolytically pickling alloy steels
Assignee: Individual
•
Filing: 1959-07-20
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Granted: 1962-07-10
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Expires: 1979-07-20
Abstract
No abstract record available.
Inventors
- 👤 Machu Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:32
CPC Classifications
C; C25; C25F; C25F1/00; C25F1/02; C25F1/04; C25F1/06; C23; C23G; C23G1/00; C23G1/02; C23G1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
125 words
PROCESS FOR ELECTROLYTICALLY PICKLING A STAINLESS STEEL ARTICLE WHICH COMPRISES THE STEPS OF SUBJECTING SAID ARTICLE AS THE ANODE TO THE ACTION OF A DIRECT ELECTRIC CURRENT IN AN ELECTROLYTE CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF AT LEAST ONE NEUTRAL SALT SELECTED FROM THE GROUP CONSISTING OF THE CHLORIDE, SULFATE AND NITRATE OF AN ALKALI METAL INCLUDING AMMONIUM, AT A CURRENT DENSITY BETWEEN ABOUT 6 AND ABOUT 10 TO 60 AMPERES PER SQUARE DECIMETER FOR A PERIOD OF ABOUT 10 TO 60 SECONDS, THE PH OF SAID ELECTROLYTE BEING MAINTAINED BETWEEN 1.0 AND 7.0, AND THEN DIPPING SAID ARTICLE IN A SOLUTION OF A MINERAL ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC, NITRIL, AND HYDROFLUORIC ACID, AND MIXTURES OF NITRIC AND HYDROFLUORIC ACIDS.
Claim 2
Dependent Claim
125 words
PROCESS FOR ELECTROLYTICALLY PICKLING A STAINLESS STEEL ARTICLE WHICH COMPRISES THE STEPS OF SUBJECTING SAID ARTICLE AS THE ANODE TO THE ACTION OF A DIRECT ELECTRIC CURRENT IN AN ELECTROLYTE CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF AT LEAST ONE NEUTRAL SALT SELECTED FROM THE GROUP CONSISTING OF THE CHLORIDE, SULFATE AND NITRATE OF AN ALKALI METAL INCLUDING AMMONIUM, AT A CURRENT DENSITY BETWEEN ABOUT 6 AND ABOUT 10 TO 60 AMPERES PER SQUARE DECIMETER FOR A PERIOD OF ABOUT 10 TO 60 SECONDS, THE PH OF SAID ELECTROLYTE BEING MAINTAINED BETWEEN 1.0 AND 7.0, AND THEN DIPPING SAID ARTICLE IN A SOLUTION OF A MINERAL ACID SELECTED FROM THE GROUP CONSISTING OF SULFURIC, NITRIL, AND HYDROFLUORIC ACID, AND MIXTURES OF NITRIC AND HYDROFLUORIC ACIDS.
References Cited (Backward Citations)
GB191203374A
Cited
US1098338A
Cited
US1542451A
Cited
US1657228A
Cited
US1859734A
Cited
US1899734A
Cited
US2244423A
Cited
US2347742A
Cited
US2327676A
Cited
US2337062A
Cited
GB576698A
Cited
US2615840A
Cited
US2893544A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-09 | 1966-01-08 | 1966-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-09 | 1970-01-08 | 1970-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-09 | 1974-01-08 | 1974-07-10 | $7700.00 | Window Closed / Lapsed |