US2535993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing trinuclear cyanine dyes
Assignee: GAF Chemicals Corp
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Filing: 1948-12-21
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Granted: 1950-12-26
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Expires: 1968-12-21
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:44
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/0075; C09B23/0083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A PROCESS FOR THE PRODUCTION OF TRINUCLEAR CYANINE DYESTUFFS WHICH COMPRISES TREATING IN THE PRESENCE OF A BASIC CONDENSING AGENT A CYCLAMMONIUM QUATERNARY SALT CONTAINING A REACTIVE METHYL GROUP IN A-POSITION TO THE NITROGEN ATOM THEREOF AND OF THE TYPE USED IN CYANINE DYES WITH A THIAZOLONE CYANINE DYE INTERMEDIATE CHARACTERIZED BY A FORMULA SELECTED FROM THE CLASS CONSISTING OF THE FOLLOWING FORMULAE:
Claim 2
Dependent Claim
63 words
A PROCESS FOR THE PRODUCTION OF TRINUCLEAR CYANINE DYESTUFFS WHICH COMPRISES TREATING IN THE PRESENCE OF A BASIC CONDENSING AGENT A CYCLAMMONIUM QUATERNARY SALT CONTAINING A REACTIVE METHYL GROUP IN A-POSITION TO THE NITROGEN ATOM THEREOF AND OF THE TYPE USED IN CYANINE DYES WITH A THIAZOLONE CYANINE DYE INTERMEDIATE CHARACTERIZED BY A FORMULA SELECTED FROM THE CLASS CONSISTING OF THE FOLLOWING FORMULAE:
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) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |