Patent US2694055A successfully refreshed from Google Patents.
US2694055A
Expired / Lapsed
US
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Metallic azo pigments
Assignee: Sherwin Williams Co
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Filing: 1951-12-10
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Granted: 1954-11-09
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Expires: 1971-12-10
Abstract
No abstract record available.
Inventors
- 👤 Thomas E Ludwig
- 👤 Oswald E Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:01
CPC Classifications
C; C09; C09B; C09B63/00; C09B63/005; Y; Y10; Y10S; Y10S534/00; Y10S534/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A LIGHT AND HEAT STABLE RED TO MAROON PIGMENTARY SUBSTANCE CONSISTING ESSENTIALLY OF THE WATER-INSOLUBLE METALLIC SALTS OF THE AZO DYESTUFF FORMED UPON DIAZOTIZATION OF DICHDLORANILINEMONOSULFONIC ACID AND COUPLING OF SAID ACID WITH 2-HYDROXY-3-NAPHTHOIC ACID.
Claim 2
Dependent Claim
35 words
A LIGHT AND HEAT STABLE RED TO MAROON PIGMENTARY SUBSTANCE CONSISTING ESSENTIALLY OF THE WATER-INSOLUBLE METALLIC SALTS OF THE AZO DYESTUFF FORMED UPON DIAZOTIZATION OF DICHDLORANILINEMONOSULFONIC ACID AND COUPLING OF SAID ACID WITH 2-HYDROXY-3-NAPHTHOIC 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) | 1957-11-08 | 1958-05-10 | 1958-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-08 | 1962-05-10 | 1962-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-08 | 1966-05-10 | 1966-11-09 | $7700.00 | Window Closed / Lapsed |