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US3630944A
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US
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Optical brightening agents with high whitening power their manufacture and use
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1969-01-27
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Granted: 1971-12-28
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Expires: 1989-01-27
Abstract
Abstract B-FORM CRYSTALS OF A COMPOUND REPRESENTED BY THE FORMULA (R-PHENYLENE-NH-(6-MORPHOLINO-S-TRIAZIN-2,4-YLENE)-NH- (3-(M-O3S-)-1,4-PHENYLENE)-CH=)2 WHEREIN R IS HYDROGEN ATOM OR METHYL GROUP; AND M IS SODIUM OR POTASSIUM HAVING A PARTICLE SIZE OF ABOUT 1X2U WHICH IS PREPARED BY PULVERIZING SAID CRYSTALS IN THE PRESENCE OF ALKALINE PHOSPHATES AND/OR ALKALINE SILICATES OR IN THE PRESENCE OF ALCOHOL, ESTER, KETONE, HYDROCARBON OR A MIXTURE THEREOF.
Inventors
- 👤 Masaaki Ohkawa
- 👤 Masatoshi Matsuo
- 👤 Tadao Sakaguchi
- 👤 Syozi Sato
- 👤 Yoshikazu Momoi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:33
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/40; C11D3/42; D; D06; D06L; D06L4/00; D06L4/60; D06L4/664
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) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |