US2524672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of salts of phthalocyanine pigments
Assignee: Wyeth Holdings LLC
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Filing: 1948-09-02
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Granted: 1950-10-03
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Expires: 1968-09-02
Abstract
No abstract record available.
Inventors
- 👤 Hans Z Lecher
- 👤 Robert E Brouillard
- 👤 Vito A Giambalvo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:02
CPC Classifications
C; C09; C09B; C09B67/00; C09B67/0032
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A METHOD OF PREPARING SALTS OF SULFURIC ACID STABLE PHTHALOCYANINE PIGMENTS WHICH COMPRISES REACTING THE PIGMENT WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF NON-OXIDIZING, STRONG MINERAL ACIDS, ALIPHATIC SULFURIC ACID ESTERS IN WHICH THE ORGANIC RADICAL CONTAINS AND MORE THAN SIX CARBON ATOMS, AROMATIC SULFONIC ACIDS OF THE BENZENE AND NAPHTHALENE SERIES, AND ALIPHATIC SUFFONIC ACIDS IN WHICH THE ORGANIC RADICAL CONTAINS NOT MORE THAN SIX CARBON ATOMS, THE AMOUNT OF THE ACID BEING AT LEAST STOICHIOMETRICALLY EQUIVALENT TO THE PHTHALOCYANINE PIGMENT BUT SMALL IN COMPARISON TO THE TOTAL VOLUME OF REACTION MEDIA, THE REACTION TAKING PLACE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN AN INERT ORGANIC LIQUID HAVING SOLVENT ACTION ON THE ACID, AND THE AMOUNT OF LIQUID BEING SUFFICIENT TO PRODUCE A READILY STIRRABLE REACTION MIXTURE THE AMOUNT OF LIQUID BEING LARGE COMPARED TO THE AMOUNT OF SULFURIC ACID.
Claim 2
Independent Claim
141 words
A METHOD OF PREPARING SALTS OF SULFURIC ACID STABLE PHTHALOCYANINE PIGMENTS WHICH COMPRISES REACTING THE PIGMENT WITH AN ACID SELECTED FROM THE GROUP CONSISTING OF NON-OXIDIZING, STRONG MINERAL ACIDS, ALIPHATIC SULFURIC ACID ESTERS IN WHICH THE ORGANIC RADICAL CONTAINS AND MORE THAN SIX CARBON ATOMS, AROMATIC SULFONIC ACIDS OF THE BENZENE AND NAPHTHALENE SERIES, AND ALIPHATIC SUFFONIC ACIDS IN WHICH THE ORGANIC RADICAL CONTAINS NOT MORE THAN SIX CARBON ATOMS, THE AMOUNT OF THE ACID BEING AT LEAST STOICHIOMETRICALLY EQUIVALENT TO THE PHTHALOCYANINE PIGMENT BUT SMALL IN COMPARISON TO THE TOTAL VOLUME OF REACTION MEDIA, THE REACTION TAKING PLACE UNDER SUBSTANTIALLY ANHYDROUS CONDITIONS IN AN INERT ORGANIC LIQUID HAVING SOLVENT ACTION ON THE ACID, AND THE AMOUNT OF LIQUID BEING SUFFICIENT TO PRODUCE A READILY STIRRABLE REACTION MIXTURE THE AMOUNT OF LIQUID BEING LARGE COMPARED TO THE AMOUNT OF SULFURIC ACID.
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) | 1953-10-02 | 1954-04-03 | 1954-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-02 | 1958-04-03 | 1958-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-02 | 1962-04-03 | 1962-10-03 | $7700.00 | Window Closed / Lapsed |