US2809138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bath solution and a process of treating metal surfaces
Assignee: Hoechst AG
•
Filing: 1955-03-11
•
Granted: 1957-10-08
•
Expires: 1975-03-11
Abstract
No abstract record available.
Inventors
- 👤 Wagner Ernst
- 👤 Moeller August
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:26
CPC Classifications
C; C23; C23C; C23C22/00; C23C22/05; C23C22/06; C23C22/46; C23C22/47
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
104 words
A BATH LIQUOR FOR TREATING METAL SURFACES IN ORDER TO PREPARE SURFACE LAYERS, SAID LIQUOR CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF OXALIC ACID ANOINS IN AN AMOUNT RANGING FROM ABOUT 0.5 GRAM TO ABOUT 140 GRAMS PER LITER, AND AN AMOUNT RANGING FROM ABOUT 0.025 GRAM TO ABOUT 5 GRAMS PER LITER OF AT LEAST ONE SOLUBLE COMPOUND SELECTED FROM THE GROUP CONSISTING OF XANTHATES, DITHIOPHOSPHORIC ACID ESTERS OF THE ALIPHATIC SERIES, DITHIOPHOSPHORIC ACID ESTERS OF THE AROMATIC SERIES, THIOGLYCOLIC ACID, AND THIOUREA, SAID AQUEOUS SOLUTION HAVING AN ACIDITY CORRESPONDING TO A PH VALUE IN THE RANGE FROM ABOUT 1.0 TO ABOUT 2.4.
Claim 2
Dependent Claim
104 words
A BATH LIQUOR FOR TREATING METAL SURFACES IN ORDER TO PREPARE SURFACE LAYERS, SAID LIQUOR CONSISTING ESSENTIALLY OF AN AQUEOUS SOLUTION OF OXALIC ACID ANOINS IN AN AMOUNT RANGING FROM ABOUT 0.5 GRAM TO ABOUT 140 GRAMS PER LITER, AND AN AMOUNT RANGING FROM ABOUT 0.025 GRAM TO ABOUT 5 GRAMS PER LITER OF AT LEAST ONE SOLUBLE COMPOUND SELECTED FROM THE GROUP CONSISTING OF XANTHATES, DITHIOPHOSPHORIC ACID ESTERS OF THE ALIPHATIC SERIES, DITHIOPHOSPHORIC ACID ESTERS OF THE AROMATIC SERIES, THIOGLYCOLIC ACID, AND THIOUREA, SAID AQUEOUS SOLUTION HAVING AN ACIDITY CORRESPONDING TO A PH VALUE IN THE RANGE FROM ABOUT 1.0 TO ABOUT 2.4.
References Cited (Backward Citations)
US1911537A
Cited
US2063629A
Cited
US2263905A
Cited
US2311653A
Cited
US2550660A
Cited
US2666002A
Cited
US2617749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |