US2980671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monomethine cyanine dyes and method for preparing them
Assignee: Gevaert Photo Producten NV
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Filing: 1958-04-15
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Granted: 1961-04-18
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Expires: 1978-04-15
Abstract
No abstract record available.
Inventors
- 👤 Nys Jean Marie
- 👤 Ghys Theofiel Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:14
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/02; C09B23/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
PROCESS FOR PREPARING A SYMMETRICAL MONOMETHINE CYANINE DYE, WHICH COMPRISES HEATING AT A TEMPERATURE BETWEEN ABOUT 100* AND 160*C. IN THE PRESENCE OF AN ALKALINE CONDENSING AGENT OF THE TYPE USED IN THE PREPARATION OF CYANINE DYES A COMPOUND OF THE GENERAL FORMULA
Claim 2
Dependent Claim
43 words
PROCESS FOR PREPARING A SYMMETRICAL MONOMETHINE CYANINE DYE, WHICH COMPRISES HEATING AT A TEMPERATURE BETWEEN ABOUT 100* AND 160*C. IN THE PRESENCE OF AN ALKALINE CONDENSING AGENT OF THE TYPE USED IN THE PREPARATION OF CYANINE DYES A COMPOUND OF THE GENERAL FORMULA
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |