US3640994A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disazo dye salts
Assignee: Bayer AG
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Filing: 1969-04-30
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Granted: 1972-02-08
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Expires: 1989-04-30
Abstract
Abstract DYE SALTS OF THE FORMULA 1-((4-(PHENYL-N=N-)PHENYL)-N=N-),2-(HO-),6,8-DI((-)O3S-) NAPHTHALENE (R-HN(+)(-CH2-CH2-CH2-CH3)2)2 IN WHICH R IS HYDROGEN OR ALKYL WITH 1-4 CARBONS ARE PRODUCED FOR USE IN BULK COLORING OF LACQUERS AND ORGANIC SYNTHEITIC MATERIALS ESPECIALLY POLYPROPYLENE.
Inventors
- 👤 Horst Harnisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:53
CPC Classifications
C; C09; C09B; C09B69/00; C09B69/02; C09B69/04; C09B69/045
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |