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US2498874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coupling 3,5 - dimethylphenylmethyl ethers of cellulose with diazonium salts
Assignee: Rohm and Haas Co
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Filing: 1947-08-19
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Granted: 1950-02-28
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Expires: 1967-08-19
Abstract
No abstract record available.
Inventors
- 👤 Louis H Bock
- 👤 Benneville Peter L De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:48
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/58; D06P3/60; D06P3/68; D06P3/685
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS FOR DYEING CELLULOSIC MATERIAL HAVING FREE ALCOHOLIC HYDROXYL GROUPS WHICH COMPRISES THE STEPS OF TREATING SAID MATERIAL WITH A SOLUTION OF A 3,5-DIMETHYLPHENYL ETHER, SUBSEQUENTLY TREATING SAID MATERIAL WITH A SOLUTION OF A DIAZONIUM SALT, AND HEATING THE CELLULOSIC MATERIAL CARRYING AT LEAST SAID 3,5-DIMETHYLPHENYL ETHER AT 120* TO 170*C., SAID 3,5-DEMETHYLPHENYL ETHER HAVING THE FORMULA
Claim 2
Dependent Claim
58 words
A PROCESS FOR DYEING CELLULOSIC MATERIAL HAVING FREE ALCOHOLIC HYDROXYL GROUPS WHICH COMPRISES THE STEPS OF TREATING SAID MATERIAL WITH A SOLUTION OF A 3,5-DIMETHYLPHENYL ETHER, SUBSEQUENTLY TREATING SAID MATERIAL WITH A SOLUTION OF A DIAZONIUM SALT, AND HEATING THE CELLULOSIC MATERIAL CARRYING AT LEAST SAID 3,5-DIMETHYLPHENYL ETHER AT 120* TO 170*C., SAID 3,5-DEMETHYLPHENYL ETHER HAVING THE FORMULA
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) | 1953-02-27 | 1953-08-29 | 1954-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-27 | 1957-08-29 | 1958-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-27 | 1961-08-29 | 1962-02-28 | $7700.00 | Window Closed / Lapsed |