Patent US4818539A successfully refreshed from Google Patents.
Patent US3833536A successfully refreshed from Google Patents.
US3833536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bulk dyeing of thermoplastics
Assignee: Bayer AG
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Filing: 1972-09-29
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Granted: 1974-09-03
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Expires: 1992-09-29
Abstract
Abstract 8,8-DIHYDROXY-NAPHTHAZINE OF THE FORMULA 1,8-DI(HO-)-DIBENZO(A,H)PHENAZINE IS SUITABLE FOR THE BULK DYEING OF PLASTICS, SUCH AS POLYCARBONATES, POLYAMIDES. POLYMERTHACRYLATES, POLYSTYRENE, POLYESTERS, POLYOLEFINES, POLYVINYLCHLORIDE AND MIXED POLYMERISATES, E.G. FROM ACRYLONTRILE, BUTADIENE AND STYRENE.
Inventors
- 👤 W Steinbeck
- 👤 H Bien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:08
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3442; C08K5/3462; C08K5/3465; C09; C09B; C09B17/00; C09B17/04
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |