US2832707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aqueous solution for and process for producing surface layers on iron and steel articles
Assignee: Hoechst AG
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Filing: 1954-03-19
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Granted: 1958-04-29
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Expires: 1974-03-19
Abstract
No abstract record available.
Inventors
- 👤 Rossteutscher Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:31
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/46; C23C22/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A PROCESS FOR PRODUCING SURFACE LAYERS ON IRON AND STEEL ARTICLES IN A STRONGLY ACID BATH WHICH COMPRISES EXPOSING THE SURFACE OF SUCH ARTICLE AT A TEMPERATURE RANGING BETWEEN ABOUT 15*C. AND ABOUT 50*C. TO THE REACTION OF AN AQUEOUS SOLUTION HAVING A PH OF FROM ABOUT 1.0 TO ABOUT 2.5 AND CONTAINING PER LITER OF SOLUTION (A) AN ALKALIMETAL CHLORATE IN A CONCENTRATION OF FROM ABOUT 7 TO ABOUT 15 GRAMS, (B) A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF OXALIC ACID, ALKALI METAL OXALATES, AND AMMONIUM OXALATE, IN A CONCENTRATION OF FROM ABOUT 5 TO ABOUT 25 GRAMS; AND (C) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF META-PHOSPHORIC, ORTHO-PHOPHORIC. PYRO-PHOSPHORIC, AND POLY-PHOSPHORIC ACIDS, AND THE ALKALI METAL AND PRIMARY AMMONIUM SALTS THEREOF IN A CONCENTRATION OF FROM ABOUT 5 TO ABOUT 60 GRAMS.
Claim 2
Dependent Claim
136 words
A PROCESS FOR PRODUCING SURFACE LAYERS ON IRON AND STEEL ARTICLES IN A STRONGLY ACID BATH WHICH COMPRISES EXPOSING THE SURFACE OF SUCH ARTICLE AT A TEMPERATURE RANGING BETWEEN ABOUT 15*C. AND ABOUT 50*C. TO THE REACTION OF AN AQUEOUS SOLUTION HAVING A PH OF FROM ABOUT 1.0 TO ABOUT 2.5 AND CONTAINING PER LITER OF SOLUTION (A) AN ALKALIMETAL CHLORATE IN A CONCENTRATION OF FROM ABOUT 7 TO ABOUT 15 GRAMS, (B) A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF OXALIC ACID, ALKALI METAL OXALATES, AND AMMONIUM OXALATE, IN A CONCENTRATION OF FROM ABOUT 5 TO ABOUT 25 GRAMS; AND (C) A COMPOUND SELECTED FROM THE GROUP CONSISTING OF META-PHOSPHORIC, ORTHO-PHOPHORIC. PYRO-PHOSPHORIC, AND POLY-PHOSPHORIC ACIDS, AND THE ALKALI METAL AND PRIMARY AMMONIUM SALTS THEREOF IN A CONCENTRATION OF FROM ABOUT 5 TO ABOUT 60 GRAMS.
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) | 1961-04-28 | 1961-10-28 | 1962-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-28 | 1965-10-28 | 1966-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-28 | 1969-10-28 | 1970-04-29 | $7700.00 | Window Closed / Lapsed |