US2694056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pigmentary substances of the azo type
Assignee: Sherwin Williams Co
•
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
2026-11-04 00:35
CPC Classifications
C; C09; C09B; C09B63/00; C09B63/005
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
45 words
A RED PIGMENTARY SUBSTANCE OF IMPROVED LIGHT AND HEAT STABILITY CONSISTING ESSENTIALLY OF THE CALCIUM SALT OF THE AZO DYESTUFF FORMED UPON DIAZOTIZATION OF DICHLOROANILINE MONOSULFONIC ACID SELECTED FROM THE GROUP CONSISTING OF 2,3-DICHLOROANILINE-5-SULFONIC ACID AND 3,4-DICHLOROANILINE-6-SULFONIC ACID, AND COUPLING THE SAID ACID WITH 2-NAPHTHOL.
Claim 2
Dependent Claim
45 words
A RED PIGMENTARY SUBSTANCE OF IMPROVED LIGHT AND HEAT STABILITY CONSISTING ESSENTIALLY OF THE CALCIUM SALT OF THE AZO DYESTUFF FORMED UPON DIAZOTIZATION OF DICHLOROANILINE MONOSULFONIC ACID SELECTED FROM THE GROUP CONSISTING OF 2,3-DICHLOROANILINE-5-SULFONIC ACID AND 3,4-DICHLOROANILINE-6-SULFONIC ACID, AND COUPLING THE SAID ACID WITH 2-NAPHTHOL.
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 |