US2839543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing cyanides of triarylmethane dyes
Assignee: Individual
•
Filing: 1955-12-02
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Granted: 1958-06-17
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Expires: 1975-12-02
Abstract
No abstract record available.
Inventors
- 👤 Chalkley Lyman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 12:55
CPC Classifications
C; C09; C09B; C09B11/00; C09B11/04; G; G03; G03C; G03C1/00; G03C1/72; G03C1/73; G03C1/732
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
A PROCESS FOR PREPARING A CYANIDE OF A TRIPHENYLMETHANE DYE HAVING A MEMBER SELECTED FROM THE CLASS CONSISTING OF -SO3X AND -CO2X ATTACHED TO A PHENYL NUCLEUS IN A POSITION ORTHO TO THE CENTRAL METHANE CARBON ATOM, X BEING A CATION, COMPRISING: CONFINING A SOLUTION OF SAID DYE AND AN ALKALI METAL CYANIDE IN A SEALED VESSEL, HEATING SAID SOLUTION TO REACT SAID CYANIDE WITH SAID DYE TO FORM THE CYANIDE OF SAID DYE WHEREIN THE NITRILE GROUP IS ATTACHED TO THE CENTRAL METHANE CARBON ATOM, AND SEPARATING SAID DYE CYANIDE FROM THE REACTION MIXTURE.
Claim 2
Dependent Claim
95 words
A PROCESS FOR PREPARING A CYANIDE OF A TRIPHENYLMETHANE DYE HAVING A MEMBER SELECTED FROM THE CLASS CONSISTING OF -SO3X AND -CO2X ATTACHED TO A PHENYL NUCLEUS IN A POSITION ORTHO TO THE CENTRAL METHANE CARBON ATOM, X BEING A CATION, COMPRISING: CONFINING A SOLUTION OF SAID DYE AND AN ALKALI METAL CYANIDE IN A SEALED VESSEL, HEATING SAID SOLUTION TO REACT SAID CYANIDE WITH SAID DYE TO FORM THE CYANIDE OF SAID DYE WHEREIN THE NITRILE GROUP IS ATTACHED TO THE CENTRAL METHANE CARBON ATOM, AND SEPARATING SAID DYE CYANIDE FROM THE REACTION MIXTURE.
References Cited (Backward Citations)
US2315661A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-06-16 | 1961-12-16 | 1962-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-16 | 1965-12-16 | 1966-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-16 | 1969-12-16 | 1970-06-17 | $7700.00 | Window Closed / Lapsed |