US3937666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of thioindigo for obtaining fluorescent dyeings in polyvinyl chloride
Assignee: Hoechst AG
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Filing: 1973-07-25
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Granted: 1976-02-10
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Expires: 1993-07-25
Abstract
Abstract A process for the fluorescent dyeing of polyvinyl chloride which consists in incorporating thioindigo into a composition consisting essentially of polyvinyl chloride, and the fluorescent dyed polyvinyl chloride composition thus produced.
Inventors
- 👤 Hugo Schafer
- 👤 Erwin Janousch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:12
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/36; C08K5/45
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
24 words
A fluorescent dyed polyvinyl chloride homopolymer composition consisting essentially of solid polyvinyl chloride homopolymer and an amount of unsubstituted thioindigo sufficient to effect fluorescence.
Claim 2
Dependent Claim
24 words
A fluorescent dyed polyvinyl chloride homopolymer composition consisting essentially of solid polyvinyl chloride homopolymer and an amount of unsubstituted thioindigo sufficient to effect fluorescence.
Claim 3
Dependent Claim
22 words
A composition according to claim 1 wherein said amount of unsubstituted thioindigo is from 0.01 to 0.5% by weight of said composition.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-02-09 | 1979-08-11 | 1980-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-02-09 | 1983-08-11 | 1984-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-02-09 | 1987-08-11 | 1988-02-10 | $7700.00 | Window Closed / Lapsed |