US3344189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Amino-fluorene-compounds and process for the preparation thereof
Assignee: Individual
•
Filing: 1963-06-24
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Granted: 1967-09-26
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Expires: 1983-06-24
Abstract
No abstract record available.
Inventors
- 👤 Davis Chester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:07
CPC Classifications
C; C07; C07C; C07C309/00; C07C309/01; C07C309/25; C07C309/26; C07C2603/00; C07C2603/02; C07C2603/04; C07C2603/06; C07C2603/10; C07C2603/12; C07C2603/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
9 words
THE FLUORENE DYE LEUCOS REPRESENTED BY THE FOLLOWING STRUCTURE:
Claim 2
Dependent Claim
9 words
THE FLUORENE DYE LEUCOS REPRESENTED BY THE FOLLOWING STRUCTURE:
Claim 3
Dependent Claim
61 words
THE PROCESS FOR TRANSFORMING TRIAMINOTRIPHENYLMETHANE DYES INTO TRIAMINOPHENYLFLUORENE DYE LEUCOS WHICH COMPRISES HEATING OVER 150*C. ON A TRANSCIENT TRIAMINOTRIPHENYLMETHANE SULFONATE WHEREBY REARRANGEMENT OF THIS TRIAMINOTRIPHENYLMETHANE SULFONATE TO A TRIAMINOPHENYLFLUORENE LEUCOSULFONATE OCCURS, FOLLOWED BY REPLACEMENT OF THE LEUCOSULFONIC ACID GROUP BY HYDROGEN TO GIVE THE CORRESPONDING TRIAMINOPHENYLFLUORENE THIS TRANSFORMATION BEING BROUGHT ABOUT IN SULFURIC ACID CONTAINING NOT MORE THAN ABOUT 25% WATER.
Claim 4
Dependent Claim
61 words
THE PROCESS FOR TRANSFORMING TRIAMINOTRIPHENYLMETHANE DYES INTO TRIAMINOPHENYLFLUORENE DYE LEUCOS WHICH COMPRISES HEATING OVER 150*C. ON A TRANSCIENT TRIAMINOTRIPHENYLMETHANE SULFONATE WHEREBY REARRANGEMENT OF THIS TRIAMINOTRIPHENYLMETHANE SULFONATE TO A TRIAMINOPHENYLFLUORENE LEUCOSULFONATE OCCURS, FOLLOWED BY REPLACEMENT OF THE LEUCOSULFONIC ACID GROUP BY HYDROGEN TO GIVE THE CORRESPONDING TRIAMINOPHENYLFLUORENE THIS TRANSFORMATION BEING BROUGHT ABOUT IN SULFURIC ACID CONTAINING NOT MORE THAN ABOUT 25% WATER.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |