US3814749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blue phenylazonaphthylazo-n-aryl peri acids
Assignee: Crompton and Knowles Corp
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Filing: 1971-12-22
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Granted: 1974-06-04
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Expires: 1991-12-22
Abstract
Abstract NEW COMPOUNDS HAVING THE STRUCTURE 1-((4-((R1-PHENYL)-N=N-)NAPHTH-1-YL)-N=N-),4-((R2-PHENYL)- NH-),5-(M-O3S-)NAPHTHALENE WHEREIN M IS -H, -NA, -K OR -NH4; R1 IS -H, -CH3, OR -CL AND R2 IS -H, -CH3 OR -OCH3 ARE USEFUL AS BLUE DYES FOR NATURAL AND SYNTHETIC POLYAMIDES AND FOR SPANDEX FIBERS.
Inventors
- 👤 J Feeman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:22
CPC Classifications
C; C09; C09B; C09B31/00; C09B31/02; C09B31/04; C09B31/053; C09B31/057
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |