US2984664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparation of pentamethincyanines
Assignee: Ilford Imaging UK Ltd
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Filing: 1959-05-06
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Granted: 1961-05-16
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Expires: 1979-05-06
Abstract
No abstract record available.
Inventors
- 👤 Fry Douglas James
- 👤 Kendall John David
- 👤 Morgan Anthony John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:48
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14; G03C1/20; C; C09; C09B; C09B23/00; C09B23/02; C09B23/08; C09B23/083; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
PROCESS FOR THE PRODUCTION OF PENTAMETHINCYNANINE DYES WHICH COMPRISES REFLUXING TOGETHER, IN THE PRESENCE OF A SOLVENT AND AN ACID BINDING AGENT, ESSENTIALLY ONE MOLECULAR EQUIVALENT OF THE PYRIMIDINE QUATERNARY SALT OF THE FORMULA:
Claim 2
Dependent Claim
34 words
PROCESS FOR THE PRODUCTION OF PENTAMETHINCYNANINE DYES WHICH COMPRISES REFLUXING TOGETHER, IN THE PRESENCE OF A SOLVENT AND AN ACID BINDING AGENT, ESSENTIALLY ONE MOLECULAR EQUIVALENT OF THE PYRIMIDINE QUATERNARY SALT OF THE FORMULA:
References Cited (Backward Citations)
US1863679A
Cited
GB435252A
Cited
US2094580A
Cited
GB425609A
Cited
FR796789A
Cited
GB560160A
Cited
US2486648A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-15 | 1964-11-14 | 1965-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-15 | 1968-11-14 | 1969-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-15 | 1972-11-14 | 1973-05-16 | $7700.00 | Window Closed / Lapsed |