Patent US4774191A successfully refreshed from Google Patents.
US4774191A
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Fluorescent conjugates bound to a support
Assignee: Siemens Healthcare Diagnostics GmbH Germany
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Filing: 1986-02-05
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Granted: 1988-09-27
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Expires: 2006-02-05
Abstract
Abstract Fluorescent antigen conjugates are provided comprising antigens covalently bonded to at least one 2,7-dialiphatic substituted-9-phenyl-6-hydroxy-3H-xanthen-3-one, wherein the 1- and 8-positions are unsubstituted. Also provided are novel fluorescent compounds absorbing at wavelengths in excess of 500 nm, having active functionalities for linking to the antigen. Finally, methods are provided for analyzing antigens in serum, whereby serum interference is avoided.
Inventors
- 👤 Pyare Khanna
- 👤 Edwin F. Ullman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:27
CPC Classifications
C; C07; C07J; C07J41/00; C07J41/0033; C07D; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/53; G01N33/531; G01N33/532; G01N33/533; Y; Y10; Y10S; Y10S436/00; Y10S436/80; Y10S436/805
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
187 words
A composition of matter consisting of a conjugate bonded to a Support, and of the formula: ##STR9## wherein: n 3 is 1 to the molecular weight of A 2 divided by 500, with the proviso that when q is 0, n 3 is 1; q is 0 or 1; p is at least 1 and up to the molecular weight of Support divided by 500; support is a molecule of at least about 10,000 molecular weight having a plurality of functionalities for linking; the group in the brackets is bonded by any convenient functionality by a bond or linking group to the Support; E b is hydrogen or chloro; E 2 is chloro; Z 2 is carboxy; R 2 is alkylene of from 1 to 3 carbon atoms; D 2 is hydrogen or carboxy; W 2 is a bond, alkylene, carboxylamidoalkylene or poly(carboxyamidoalkylene), wherein alkylene is of from 1 to 2 carbon atoms; Y 2 is non-oxo-carbonyl; A 2 is a hapten of up to about 2,000 molecular weight bonded to Y 2 ; m 2 is 0 to 3; and x 2 is 0 to 4.
Claim 2
Dependent Claim
187 words
A composition of matter consisting of a conjugate bonded to a Support, and of the formula: ##STR9## wherein: n 3 is 1 to the molecular weight of A 2 divided by 500, with the proviso that when q is 0, n 3 is 1; q is 0 or 1; p is at least 1 and up to the molecular weight of Support divided by 500; support is a molecule of at least about 10,000 molecular weight having a plurality of functionalities for linking; the group in the brackets is bonded by any convenient functionality by a bond or linking group to the Support; E b is hydrogen or chloro; E 2 is chloro; Z 2 is carboxy; R 2 is alkylene of from 1 to 3 carbon atoms; D 2 is hydrogen or carboxy; W 2 is a bond, alkylene, carboxylamidoalkylene or poly(carboxyamidoalkylene), wherein alkylene is of from 1 to 2 carbon atoms; Y 2 is non-oxo-carbonyl; A 2 is a hapten of up to about 2,000 molecular weight bonded to Y 2 ; m 2 is 0 to 3; and x 2 is 0 to 4.
Claim 3
Dependent Claim
13 words
A composition of matter according to claim 1, wherein support is a polysaccharide.
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) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |