Patent US2521485A successfully refreshed from Google Patents.
US2521485A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of printing with sulfuric acid esters of leuco vat dyes of the anthraquinone series
Assignee: GAF Chemicals Corp
•
Filing: 1948-02-25
•
Granted: 1950-09-05
•
Expires: 1968-02-25
Abstract
No abstract record available.
Inventors
- 👤 Schoen Andre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:52
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/22; D06P1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
74 words
A PRINTING PASTE FREE FROM ACID SPLITTING AGENTS AND CAPABLE OF YIELDING WHEN APPLIED TO A FIBER AND STEAM-DEVELOPED FOR 5 MINUTES PRINTS FAST TO WASHING AND OF HIGH INTENSITY, CONTAINING AS ITS ESSENTIAL COMPONENTS A LEUCO SULFURIC ACID ESTER OF AN ANTHRAQUINONE VAT DYE, A THICKNER, AN OXIDIZING AGENT, AND OXIDIZING CATALYST AND AN ORGANIC SULFUR COMPOUND SELECTED FROM THE CLASS CONSISTING OF ALDEHYDE BISULFITES, ALDEHYDE SULFOXYLATES, AND THE ALKALI METAL SALTS THEREOF.
Claim 2
Dependent Claim
74 words
A PRINTING PASTE FREE FROM ACID SPLITTING AGENTS AND CAPABLE OF YIELDING WHEN APPLIED TO A FIBER AND STEAM-DEVELOPED FOR 5 MINUTES PRINTS FAST TO WASHING AND OF HIGH INTENSITY, CONTAINING AS ITS ESSENTIAL COMPONENTS A LEUCO SULFURIC ACID ESTER OF AN ANTHRAQUINONE VAT DYE, A THICKNER, AN OXIDIZING AGENT, AND OXIDIZING CATALYST AND AN ORGANIC SULFUR COMPOUND SELECTED FROM THE CLASS CONSISTING OF ALDEHYDE BISULFITES, ALDEHYDE SULFOXYLATES, AND THE ALKALI METAL SALTS THEREOF.
References Cited (Backward Citations)
US2389245A
Cited
US2182964A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |