Patent US2504468A successfully refreshed from Google Patents.
US2504468A
Expired / Lapsed
US
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Process of preparing trinuclear cyanine dyes
Assignee: GAF Chemicals Corp
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Filing: 1947-11-18
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Granted: 1950-04-18
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Expires: 1967-11-18
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Thompson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:25
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/0075; C09B23/0083
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
17 words
A PROCESS FOR THE PRODUCTION OF TRINUCLEAR CYANINE DYESTUFFS COMPRISING TREATING A THIAZOLONE OF THE GENERAL FORMULA:
Claim 2
Dependent Claim
17 words
A PROCESS FOR THE PRODUCTION OF TRINUCLEAR CYANINE DYESTUFFS COMPRISING TREATING A THIAZOLONE OF THE GENERAL 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) | 1953-04-17 | 1953-10-17 | 1954-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-04-17 | 1957-10-17 | 1958-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-04-17 | 1961-10-17 | 1962-04-18 | $7700.00 | Window Closed / Lapsed |