US3637672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Azole compounds
Assignee: Nippon Kayaku Co Ltd
•
Filing: 1968-07-09
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Granted: 1972-01-25
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Expires: 1988-07-09
Abstract
Abstract AZOLE COMPOUNDS USEFUL FOR FLUORESCENT BRIGHTENING AGENTS FOR SYNTHETIC FIBERS, SUCH AS 1-(5-(CH3-)BENZOXAZOL-2-YL),4-((5-PHENYL-1,3,4-OXADIAZOL- 2-YL)-CH=CH-)BENZENE THE COMPOUND IS PREPARED BY HEATING 2-(4-(PHENYL-CO-NH-NH-CO-CH=CH-)PHENYL),5-(CH3-)- BENZOXAZOLE WITH A DEHYDRATING AGENT OF THIONYL CHLORIDE IN ORDER TO CAUSE RING FORMATION.
Inventors
- 👤 Shuichi Seino
- 👤 Tomizo Fujino
- 👤 Kakuji Tonegawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:26
CPC Classifications
C; C07; C07D; C07D263/00; C07D263/52; C07D263/54; C07D263/56; C07D263/57; C07D235/00; C07D235/02; C07D235/04; C07D235/06; C07D235/16; C07D271/00; C07D271/02; C07D271/10; C07D271/107; C09; C09B; C09B23/00; C09B23/14
Claims Analysis
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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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |