US3177210A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing cyanine spectral sensitizing dyes
Assignee: Polaroid Corp
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Filing: 1962-11-29
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Granted: 1965-04-06
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Expires: 1982-11-29
Abstract
No abstract record available.
Inventors
- 👤 Alan E Rosenoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:52
CPC Classifications
C; C09; C09B; C09B23/00; C09B23/02; G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08; G03C1/10; G03C1/12; G03C1/14
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
37 words
THE PROCESS OF PREPARING ANHYDRO-4,54'',5''-DIBENZO9-METHYL-3,3''-BIS-($-SULFOPROPYL) - THIACARBOCYANINE HYDROXIDE WHICH COMPRISES HEATING 2-METHYL-NAPHTHOL(1,2-D) THIAZOLE WITH 1,3-PROPANE SULTONE TO PROVIDE 2-METHYL-3($-SULFOPROPYL)-NAPHTHOL(1,2D)THIAZOLIUM INNER SALT AND THEN CONDENSING THE THUS-PREPARED PRODUCT, IN THE PRESENCE OF A BASIC CONDENSING AGENT WITH TRIETHVLORTHOPROPIONATE.
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) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |