US2807544A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light sensitive diazotype compositions containing alumina pigments
Assignee: GAF Chemicals Corp
•
Filing: 1953-12-22
•
Granted: 1957-09-24
•
Expires: 1973-12-22
Abstract
No abstract record available.
Inventors
- 👤 Frederick Joseph Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/61
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
THE PROCESS OF PRODUCING AZO DYE IMAGES HAVING A MATTE APPEARANCE AND HIGH DENSITY AND BRIGHTNESS WHICH COMPRISES EXPOSING UNDER A PATTERN A BASE COATED WITH A SENSITIZING COMPOSITION COMPRISING AN AQUEOUS DISPERSION OF TIGHT SENSITIVE DIAZONIUM COMPOUND, AN AZO DYE COUPLING COMPONENT AND A SUBSTANTIALLY CHEMICALLY PURE ALUMINUM OXIDE HAVING A PARTICLE SIZE RANGING FROM 5 MICRONS DOWNWARD, AND SUBJECTING THE EXPOSED BASE TO AN ALKALI TO EFFECT AZO DYE FORMATION BETWEEN THE COUPLING COMPONENT AND RESIDUAL DIAZONIUM COMPOUND.
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) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |