US4492648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light-collecting systems using halogenated perylene derivatives as light converters
Assignee: Bayer AG
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Filing: 1982-12-07
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Granted: 1985-01-08
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Expires: 2002-12-07
Abstract
Abstract Light-collecting system, characterized in that it contains a dyestuff of the formula ##STR1## in which Hal designates identical or different halogen atoms from the series comprising fluorine, chlorine and bromine, R 1 and R 2 designate hydrogen or optionally substituted C 1 -C 18 -alkyl and n designates 4-5, and new dyestuffs of the formula I which in a 0.5-2 mM solution in path lengths of 10 cm display an increase in transmission from 0 to >95% with a change in the wavelength of 25-120 nm.
Inventors
- 👤 Uwe Claussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:01
CPC Classifications
H; H10; H10F; H10F77/00; H10F77/40; H10F77/42; H10F77/45; C; C08; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3432; C08K5/3437; C09; C09B; C09B5/00; C09B5/62; C09K; C09K11/00; C09K11/06; Y; Y02; Y02E; Y02E10/00; Y02E10/50; Y02E10/52
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
In a light-collecting system comprising emission areas and absorption areas wherein the ratio of emission areas to absorption areas are 1:10 to 1:1,000, said light-collecting system comprising a transparent, optically usable plastic which contains centers capable of fluorescence, the improvement wherein said centers capable of fluorescence comprise a mixture of dyestuffs of the formula ##STR4## in which R 1 and R 2 designate hydrogen, unsubstituted C 1 -C 18 -alkyl radicals or C 1 -C 18 -alkyl radicals substituted by C 1 -C 10 -alkoxy, C 1 -C 10 -alkylthio, halogen or cyano, and consisting of about 1 to about 20% by weight of the pentachloro derivatives and about 99 to about 80% by weight of the tetrachloro derivatives.
Claim 2
Dependent Claim
119 words
In a light-collecting system comprising emission areas and absorption areas wherein the ratio of emission areas to absorption areas are 1:10 to 1:1,000, said light-collecting system comprising a transparent, optically usable plastic which contains centers capable of fluorescence, the improvement wherein said centers capable of fluorescence comprise a mixture of dyestuffs of the formula ##STR4## in which R 1 and R 2 designate hydrogen, unsubstituted C 1 -C 18 -alkyl radicals or C 1 -C 18 -alkyl radicals substituted by C 1 -C 10 -alkoxy, C 1 -C 10 -alkylthio, halogen or cyano, and consisting of about 1 to about 20% by weight of the pentachloro derivatives and about 99 to about 80% by weight of the tetrachloro derivatives.
Claim 3
Dependent Claim
15 words
A light-collecting system according to claim 1, wherein R 1 and R 2 designate methyl.
Claim 4
Dependent Claim
38 words
A light-collecting system according to claim 1, wherein the dyestuff mixture in 0.5-2 mM solution in path lengths of 10 cm displays an increase in transmission from 0 to 95% with a change in wavelength of 25-120 nm.
Claim 5
Dependent Claim
38 words
A light-collecting system according to claim 1, wherein the dyestuff mixture in 0.5-2 mM solution in path lengths of 10 cm displays an increase in transmission from 0 to 95% with a change of wavelength of 35-100 nm.
Claim 6
Dependent Claim
22 words
A light-collecting system according to claim 1, wherein said plastic is a homopolymer or copolymer of acrylic acid or a derivative thereof.
Claim 7
Dependent Claim
13 words
A light-collecting system according to claim 1, wherein such plastic is polymethyl methacrylate.
Claim 8
Dependent Claim
13 words
A light-collecting system according to claim 1, wherein said plastic is a polycarbonate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-01-08 | 1988-07-09 | 1989-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-01-08 | 1992-07-09 | 1993-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-01-08 | 1996-07-09 | 1997-01-08 | $7700.00 | Window Closed / Lapsed |