Patent US1014760A successfully refreshed from Google Patents.
Patent US3635955A successfully refreshed from Google Patents.
US3635955A
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Substantially pure basic dyes derived from 4-methylene-1 3-disubstituted-3 4-dihydropyrimidones
Assignee: BASF SE
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Filing: 1970-05-22
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Granted: 1972-01-18
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Expires: 1990-05-22
Abstract
Abstract SUBSTANTIALLY PURE BASIC DYES DERIVED FROM 4-METHYLENE1,3-DISUBSITUTED-3,4-DIHYDROPYRIMIDONES WHICH ARE EMINENTLY SUITABLE FOR DYEING AND PRINTING TEXTILE MATERIALS MADE OF ACRYLONITRILE POLYMERS.
Inventors
- 👤 Guenter Hansen
- 👤 Matthias Seefelder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:42
CPC Classifications
C; C09; C09B; C09B26/00; C09B26/02; C09B26/04
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |