US2829148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purification of cyanides of triarylmethane dyes
Assignee: Individual
•
Filing: 1955-12-15
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Granted: 1958-04-01
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Expires: 1975-12-15
Abstract
No abstract record available.
Inventors
- 👤 Chalkley Lyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:05
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; C09B11/10; C09B11/22; C09B67/00; C09B67/0096; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
THE METHOD OF PURIFYING CRUDE TRIPHENYLMETHANE DYE CYANIDES HAVING AT LEAST TWO PRIMARY AMINO GROUPS PARA TO THE CENTRAL METHANE CARBON ATOM, COMPRISING DISSOLVING SAID CRUDE DYE CYANIDE IN A SOLVENT COMPRISING TRIETHYL PHOSPHATE, DILUTING THE SOLUTION SO FORMED WITH WATER TO PRECIPITATE PURIFIED DYE CYANIDE THEREFROM, AND SEPARATING SAID PRECIPITATED DYE CYANIDE FROM SAID SOLUTION.
Claim 2
Independent Claim
56 words
THE METHOD OF PURIFYING CRUDE TRIPHENYLMETHANE DYE CYANIDES HAVING AT LEAST TWO PRIMARY AMINO GROUPS PARA TO THE CENTRAL METHANE CARBON ATOM, COMPRISING DISSOLVING SAID CRUDE DYE CYANIDE IN A SOLVENT COMPRISING TRIETHYL PHOSPHATE, DILUTING THE SOLUTION SO FORMED WITH WATER TO PRECIPITATE PURIFIED DYE CYANIDE THEREFROM, AND SEPARATING SAID PRECIPITATED DYE CYANIDE FROM SAID SOLUTION.
References Cited (Backward Citations)
US36356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |