Patent US4997897A successfully refreshed from Google Patents.
US4997897A
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Polymerizable dye
Assignee: Bausch and Lomb Inc
•
Filing: 1990-08-03
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Granted: 1991-03-05
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Expires: 2010-08-03
Abstract
Abstract Dye monomers of the general chemical formula <IMAGE> where X denotes an unsaturated polymerizable organic radical; and R is an organic diradical with 2 to 12 carbon atoms.
Inventors
- 👤 John B. Melpolder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:39
CPC Classifications
C; C09; C09B; C09B69/00; C09B69/10; C09B69/101; C09B1/00; C09B1/16; C09B1/20; C09B1/26; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
41 words
A hydrogel article formed by polymerizing a precopolymer mixture comprising a hydrophilic monomer and a compound having the general formula ##STR4## wherein: R denotes a divalent radical with 1 to 12 carbon atoms; and X denotes a polymerizable unsaturated organic radical.
Claim 2
Dependent Claim
41 words
A hydrogel article formed by polymerizing a precopolymer mixture comprising a hydrophilic monomer and a compound having the general formula ##STR4## wherein: R denotes a divalent radical with 1 to 12 carbon atoms; and X denotes a polymerizable unsaturated organic radical.
Claim 3
Dependent Claim
19 words
The article of claim 1 wherein X is --Y--CO--C(Z)═CH 2 wherein Y is--O--or --NH--and Z is hydrogen or methyl.
Claim 4
Dependent Claim
10 words
The article of claim 1 wherein the compound is 1,4-bis(4-(2-methacryloxyethyl)phenylamino)anthraquinone.
Claim 5
Dependent Claim
15 words
An article as in claims 1, 2, or 3 wherein the precopolymer mixture contains 2-hydroxyethylmethacrylate.
Claim 6
Dependent Claim
16 words
An article as in claims 1, 2, or 3 wherein the precopolymer mixture contains N-vinyl pyrrolidone.
Claim 7
Dependent Claim
13 words
A hydrogel article as in claim 4 which is a soft contact lens.
Claim 8
Dependent Claim
13 words
A hydrogel article as in claim 5 which is a soft contact lens.
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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) | 1994-03-04 | 1994-09-03 | 1995-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-04 | 1998-09-03 | 1999-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-04 | 2002-09-03 | 2003-03-05 | $7700.00 | Window Closed / Lapsed |