Patent US2987425A successfully refreshed from Google Patents.
US2987425A
Expired / Lapsed
US
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Acid pickling process
Assignee: Imperial Chemical Industries Ltd
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Filing: 1957-09-16
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Granted: 1961-06-06
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Expires: 1977-09-16
Abstract
No abstract record available.
Inventors
- 👤 Shaw Richard Elliott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:35
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/73; B; B01; B01J; B01J19/00; B01J19/02; B01J19/16; C23G; C23G1/00; C23G1/02; B01J2219/00; B01J2219/02; B01J2219/0204; B01J2219/025; B01J2219/0277
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
A PROCESS OF PICKLING METAL WHICH COMPRISES PROVIDING AN ACID PICKLING SOLUTION, COVERING ALL OF THE SURFACE OF SAID SOLUTION WITH A NON-AQUEOUS SURFACE LAYER OF INERT LIQUID WHICH IS SUBSTANTIALLY IMMISCIBLE WITH SAID PICKLING SOLUTION AND SUBSTANTIALLY NON-VOLATILE AND STABLE AT THE OPERATING TEMPERATURE OF SAID SOLUTION, INCLUDING IN SAID SURFACE LAYER AND SAID PICKLING SOLUTION A SURFACE ACTIVE AGENT WHICH IS SOLUBLE IN BOTH SAID LAYER AND SAID PICKLING SOLUTION, THEREAFTER PASSING THE METAL TO BE PICKLED THROUGH SAID SURFACE LAYER AND INTO SAID SOLUTION, WITHDRAWING THE THUS PICKLED METAL THROUGH SAID SURFACE LAYER, AND THEN RINSING SAID METAL WITH WATER WHEREBY THE SURFACE ACTIVE AGENT IN SAID SURFACE LAYER FACILITATES THE REMOVAL OF ANY ADHERENT SURFACE LAYER.
Claim 2
Dependent Claim
120 words
A PROCESS OF PICKLING METAL WHICH COMPRISES PROVIDING AN ACID PICKLING SOLUTION, COVERING ALL OF THE SURFACE OF SAID SOLUTION WITH A NON-AQUEOUS SURFACE LAYER OF INERT LIQUID WHICH IS SUBSTANTIALLY IMMISCIBLE WITH SAID PICKLING SOLUTION AND SUBSTANTIALLY NON-VOLATILE AND STABLE AT THE OPERATING TEMPERATURE OF SAID SOLUTION, INCLUDING IN SAID SURFACE LAYER AND SAID PICKLING SOLUTION A SURFACE ACTIVE AGENT WHICH IS SOLUBLE IN BOTH SAID LAYER AND SAID PICKLING SOLUTION, THEREAFTER PASSING THE METAL TO BE PICKLED THROUGH SAID SURFACE LAYER AND INTO SAID SOLUTION, WITHDRAWING THE THUS PICKLED METAL THROUGH SAID SURFACE LAYER, AND THEN RINSING SAID METAL WITH WATER WHEREBY THE SURFACE ACTIVE AGENT IN SAID SURFACE LAYER FACILITATES THE REMOVAL OF ANY ADHERENT SURFACE LAYER.
References Cited (Backward Citations)
US870508A
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US1329467A
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US1817527A
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US2115005A
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US2524825A
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US2583165A
Cited
US2640767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |