Patent JPS6010284A successfully refreshed from Google Patents.
US4446324A
Expired / Lapsed
US
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Perylenetetracarboxylic acid diimides and their use
Assignee: BASF SE
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Filing: 1981-12-09
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Granted: 1984-05-01
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Expires: 2001-12-09
Abstract
Abstract Novel perylene-3,4,9,10-tetracarboxylic acid diimides of the formula ##STR1## where R 1 and R 2 are each isopropyl or R 1 is methyl or ethyl and R 2 is C 3 - or C 4 -alkyl, give clear, luminous, very lightfast, fluorescent orange colorations in plastics. The dyes are particularly suitable for concentrating light.
Inventors
- 👤 Fritz Graser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:00
CPC Classifications
C; C09; C09B; C09B5/00; C09B5/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
7 words
Perylene-3,4,9,10-tetracarboxylic acid diimide of the formula ##STR5##
Claim 2
Dependent Claim
7 words
Perylene-3,4,9,10-tetracarboxylic acid diimide of the formula ##STR5##
References Cited (Backward Citations)
DE1094897B
Cited
DE1807729A1
Cited
DE2139688A1
Cited
FR2148510A1
Cited
DE2210170A1
Cited
DE2237539A1
Cited
DE3001858A1
Cited
EP0033079A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |