Patent US3769279A successfully refreshed from Google Patents.
US3769279A
Expired / Lapsed
US
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Hydrazone dyestuffs
Assignee: Bayer AG
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Filing: 1971-08-18
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Granted: 1973-10-30
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Expires: 1991-08-18
Abstract
Abstract HYDRAZONE DYESTUFFS, PROCESSES FOR THEIR MANUFACTURE AND THEIR USE FOR DYEING AND PRINTING OF POLYACRYLNITRILE, COPOLYMERS OF ACRYLNITRILE WITH OTHER VINYL COMPOUNDS, ACID MODIFIED AROMATIC POLYESTERS, ACID MODIFIED POLYAMIDES, LEATHER, TANNED COTTON, CELLULOSE, POLYURETHANES AND FOR THE PRODUCTION OF WRITING LIQUIDS AND STAMPING INKS.
Inventors
- 👤 H Kuhlthau
- 👤 R Raue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:08
CPC Classifications
C; C09; C09B; C09B26/00; C09B26/02; C09B26/04; C09B44/00; C09B44/10; C09B44/12; C09B44/123
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |