US2793133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of finely divided berlin blue
Assignee: Chem Fab Wesseling A G
•
Filing: 1954-12-16
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Granted: 1957-05-21
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Expires: 1974-12-16
Abstract
No abstract record available.
Inventors
- 👤 Verbeek Hans
- 👤 Gratzfeld Eberhard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:25
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/22; C09C1/26; C01; C01P; C01P2004/00; C01P2004/80; C01P2006/00; C01P2006/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
127 words
IN A PROCESS FOR THE PRODUCTION OF BERLIN BLUE PIGMENT BY PRECIPITATION OF BERLIN WHITE FROM A REACTION SOLUTION COMPRISING A FERROUS SALT AND AN ALKALI METAL FERROCYANIDE AND OXIDATION OF SAID BERLIN WHITE TO PRODUCE BERLIN BLUE, THE STEPS WHICH COMPRISES INCORPORATING IN THE LIQUID REACTION SOLUTION 5 TO 40%, CALCULATED ON THE WEIGHT OF THE PIGMENT PRODUCED, ON AN ORGANIC LACQUER CONSTITUENT SELECTED FROM THE GROUP CONSISTING OF LACQUER PLASTICIZERS, NON-OXIDATIVE-DRYING FILM FORMING LACQUER OILS, HIGH-BOILING LACQUER SOLVENTS AND FILM FORMING LACQUER RESINS EFFECTING THE PRECIPITATION OF BERLIN WHITE FROM THE REACTION SOLUTION IN THE PRESENCE OF SAID LACQUER CONSTITUENT TO PROVIDE A COATING OF SAID LACQUER CONSTITUENT ON THE BERLIN WHITE AS IT IS PRECIPITATED AND OXIDIZING SAID COATED BERLIN WHITE TO BERLIN BLUE.
Claim 2
Dependent Claim
127 words
IN A PROCESS FOR THE PRODUCTION OF BERLIN BLUE PIGMENT BY PRECIPITATION OF BERLIN WHITE FROM A REACTION SOLUTION COMPRISING A FERROUS SALT AND AN ALKALI METAL FERROCYANIDE AND OXIDATION OF SAID BERLIN WHITE TO PRODUCE BERLIN BLUE, THE STEPS WHICH COMPRISES INCORPORATING IN THE LIQUID REACTION SOLUTION 5 TO 40%, CALCULATED ON THE WEIGHT OF THE PIGMENT PRODUCED, ON AN ORGANIC LACQUER CONSTITUENT SELECTED FROM THE GROUP CONSISTING OF LACQUER PLASTICIZERS, NON-OXIDATIVE-DRYING FILM FORMING LACQUER OILS, HIGH-BOILING LACQUER SOLVENTS AND FILM FORMING LACQUER RESINS EFFECTING THE PRECIPITATION OF BERLIN WHITE FROM THE REACTION SOLUTION IN THE PRESENCE OF SAID LACQUER CONSTITUENT TO PROVIDE A COATING OF SAID LACQUER CONSTITUENT ON THE BERLIN WHITE AS IT IS PRECIPITATED AND OXIDIZING SAID COATED BERLIN WHITE TO BERLIN BLUE.
References Cited (Backward Citations)
US2342478A
Cited
US2251871A
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US2335760A
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US2384579A
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US2445770A
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US2454453A
Cited
US2575347A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-05-20 | 1960-11-19 | 1961-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-05-20 | 1964-11-19 | 1965-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-05-20 | 1968-11-19 | 1969-05-21 | $7700.00 | Window Closed / Lapsed |