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Patent US3373199A successfully refreshed from Google Patents.
US3373199A
Expired / Lapsed
US
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Water-miscible, storage-stable auramine base solution and process of preparing same
Assignee: EIDP Inc
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Filing: 1962-05-28
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Granted: 1968-03-12
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Expires: 1982-05-28
Abstract
No abstract record available.
Inventors
- 👤 Cohen Werner Victor
- 👤 Dietemann Eugene Coley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:27
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/02; Y; Y10; Y10S; Y10S8/00; Y10S8/916; Y10S8/919
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
80 words
A WATER-MISCIBLE, STORAGE-STABLE, COLORING COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF A SOLUTION OF AURAMINE BASE IN A SOLVENT CONSISTING OF MIXTURES OF ACETIC ACID WITH HYDROXYACETIC ACID CONTAINING THE LATTER IN A QUANTITY NOT EXCEEDING 30% BY WEIGHT, SAID SOLUTION BEING ESSENTIALLY FREE OF MINERAL ACIDS, INORGANIC SALTS, SALTS OF AURAMINE BASE, AND MICHLER''S KETONE, SAID SOLUTION BEING FREE OF MOISTURE IN EXCESS OF 1.5% BY WEIGHT AND ALSO FREE OF ACETIC SALTS IN EXCESS OF ABOUT 3% BY WEIGHT.
Claim 2
Dependent Claim
80 words
A WATER-MISCIBLE, STORAGE-STABLE, COLORING COMPOSITION OF MATTER CONSISTING ESSENTIALLY OF A SOLUTION OF AURAMINE BASE IN A SOLVENT CONSISTING OF MIXTURES OF ACETIC ACID WITH HYDROXYACETIC ACID CONTAINING THE LATTER IN A QUANTITY NOT EXCEEDING 30% BY WEIGHT, SAID SOLUTION BEING ESSENTIALLY FREE OF MINERAL ACIDS, INORGANIC SALTS, SALTS OF AURAMINE BASE, AND MICHLER''S KETONE, SAID SOLUTION BEING FREE OF MOISTURE IN EXCESS OF 1.5% BY WEIGHT AND ALSO FREE OF ACETIC SALTS IN EXCESS OF ABOUT 3% BY WEIGHT.
Claim 3
Dependent Claim
102 words
A PROCESS FOR PREPARING A WATER-MISCIBLE, STORAGESTABLE, SOLUTION OF AURAMINE BASE, WHICH COMPRISES (1) REACTING AURAMINE WITH A WATER-SOLUBLE ALKALI WHEREBY TO PRODUCE AURAMINE BASE, (2) FILTERING OFF THE LATTER AND DRYING THE SAME AT A TEMPERATURE NOT EXCEEDING 60*C. WHEREBY TO MINIMIZE HYDROLYSIS OF THE BASE DURING SAID DRYING STEP, AND (3) DISSOLVING THE DRIED BASE AT A TEMPERATURE NOT EXCEEDING 60*C. IN A SOLVENT CONSISTING OF MIXTURES OF ACETIC ACID WITH HYDROXYACETIC ACID CONTAINING THE LATTER IN A QUANTITY NOT EXCEEDING 30% BY WEIGHT, DISSOLVING STEP EXCLUDING CONTAMINATION OF THE SOLUTION WITH MOISTURE IN A QUANTITY EXCEEDING 1.5% BY WEIGHT.
Claim 4
Dependent Claim
102 words
A PROCESS FOR PREPARING A WATER-MISCIBLE, STORAGESTABLE, SOLUTION OF AURAMINE BASE, WHICH COMPRISES (1) REACTING AURAMINE WITH A WATER-SOLUBLE ALKALI WHEREBY TO PRODUCE AURAMINE BASE, (2) FILTERING OFF THE LATTER AND DRYING THE SAME AT A TEMPERATURE NOT EXCEEDING 60*C. WHEREBY TO MINIMIZE HYDROLYSIS OF THE BASE DURING SAID DRYING STEP, AND (3) DISSOLVING THE DRIED BASE AT A TEMPERATURE NOT EXCEEDING 60*C. IN A SOLVENT CONSISTING OF MIXTURES OF ACETIC ACID WITH HYDROXYACETIC ACID CONTAINING THE LATTER IN A QUANTITY NOT EXCEEDING 30% BY WEIGHT, DISSOLVING STEP EXCLUDING CONTAMINATION OF THE SOLUTION WITH MOISTURE IN A QUANTITY EXCEEDING 1.5% BY WEIGHT.
References Cited (Backward Citations)
US1635628A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-12 | 1971-09-11 | 1972-03-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-12 | 1975-09-11 | 1976-03-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-12 | 1979-09-11 | 1980-03-12 | $7700.00 | Window Closed / Lapsed |