US2694657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pickling ferrous metals
Assignee: Ekstrand and Tholand Inc
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Filing: 1951-09-28
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Granted: 1954-11-16
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Expires: 1971-09-28
Abstract
No abstract record available.
Inventors
- 👤 Brundin Nils Herman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:40
CPC Classifications
C; C23; C23G; C23G1/00; C23G1/02; C23G1/08; C23G1/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
41 words
A PROCESS OF PICKLING A FERROUS METAL, WHICH COMPRISES SUBJECTING THE SURFACEF TO BE PICKLED OF THE METAL, AT A PICKLING TEMPERATURE, TO THE PICKLING ACTION OF AN AQUEOUS SOLUTION CONTAINING AS THE PICKLING AGENT A PICKLING CONCENTRATION OF AMMONIUM BISULFATE.
Claim 2
Dependent Claim
41 words
A PROCESS OF PICKLING A FERROUS METAL, WHICH COMPRISES SUBJECTING THE SURFACEF TO BE PICKLED OF THE METAL, AT A PICKLING TEMPERATURE, TO THE PICKLING ACTION OF AN AQUEOUS SOLUTION CONTAINING AS THE PICKLING AGENT A PICKLING CONCENTRATION OF AMMONIUM BISULFATE.
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) | 1957-11-15 | 1958-05-17 | 1958-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-15 | 1962-05-17 | 1962-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-15 | 1966-05-17 | 1966-11-16 | $7700.00 | Window Closed / Lapsed |