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Patent US3759902A successfully refreshed from Google Patents.
US3759902A
Expired / Lapsed
US
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Methine dyestuffs
Assignee: Bayer AG
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Filing: 1971-08-17
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Granted: 1973-09-18
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Expires: 1991-08-17
Abstract
Abstract METHINE DYESTUFFS, PROCESSES FOR THEIR MANUFACTURE AND THEIR USE OF DYEING AND PRINTING OF POLYACRYLONITRILE, COPOLYMERS OF ACRYLONITRILE 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
- 👤 K Lehment
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:31
CPC Classifications
C; C07; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/10; C07D209/14; C09; C09B; C09B23/00; C09B23/16; C09B23/162; C09B23/164; C09B69/00; C09B69/02; C09B69/06; D; D06; D06P; D06P1/00; D06P1/90; D06P1/908
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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |