US3591575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of diazonium compounds
Assignee: Polychrome Corp
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Filing: 1967-08-14
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Granted: 1971-07-06
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Expires: 1987-08-14
Abstract
Abstract A METHOD FOR MAKING A STORAGE-STABLE, MOISTURE-RESISTANT, LIGHT-SENSITIVE DIAZONIUM COMPOUND IN DRY POWDER FORM BY REACTING A LIGHT-SENSITIVE, WATER-SOLUBLE DIAZO COMPOUND WITH A HYDROXYL-CONTAINING COUPLING AGENT THEREFOR IN AN AQUEOUS MEDIUM AT A PH OF ABOUT 1.5 TO ABOUT 7.5 SUBSTANTIALLY TO AVOID RESINIFICATION AND LOSS OF LIGHT-SENSITIVITY, AND RECOVERING THE PRECIPITATED DIAZONIUM COMPOUND REACTION PRODUCT.
Inventors
- 👤 Eugene Golda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:34
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/016; G03F7/021
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |