US4569858A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface modification of hydrophilic contact lenses
Assignee: PILINGTON BARNES HIND Inc
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Filing: 1985-01-28
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Granted: 1986-02-11
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Expires: 2005-01-28
Abstract
Abstract The present invention relates to a method of modifying a surface of a soft contact lens to make the lens resistant to soiling. The method comprises initiating a reaction between the unhydrated lens surface containing carboxylic acid or alcohol moieties and agents capable of reacting with carboxylic acid or alcohol moieties in order to produce a surface which then either has a hydrophobic coating, a nonionic hydrophilic coating or is charged.
Inventors
- 👤 Drahoslav Lim
- 👤 Peter C. Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:57
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
68 words
A method of modifying a surface of a soft contact lens which makes it resistant to soiling, said method comprising initiating a reaction between an unhydrated lens surface containing carboxylic acid of alcohol moieties and an agent capable of reacting with carboxylic acid or alcohol moieties wherein said agent is a diazoalkane, dimethyl formamide dialkyl acetal, alkylenediisocyanate or the reaction product of alkylenediisocyanate and polyethylene glycol monomethyl ether.
Claim 2
Independent Claim
68 words
A method of modifying a surface of a soft contact lens which makes it resistant to soiling, said method comprising initiating a reaction between an unhydrated lens surface containing carboxylic acid of alcohol moieties and an agent capable of reacting with carboxylic acid or alcohol moieties wherein said agent is a diazoalkane, dimethyl formamide dialkyl acetal, alkylenediisocyanate or the reaction product of alkylenediisocyanate and polyethylene glycol monomethyl ether.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein the agent is diazomethane, dimethylformamide dimethyl acetal, hexamethylene diisocyanate, or the reaction product of polyethylene glycol monomethyl ether and hexamethylene diisocyanate.
Claim 4
Dependent Claim
13 words
A contact lens made resistant to soiling by the method of claim 1.
Claim 5
Independent Claim
56 words
A method of modifying a surface of a soft contact lens which makes it resistant to soiling, said method comprising (a) treatment of the surface of an unhydrated lens with a strong base in a non-swelling solvent to produce anionic groups on the surface; and (b) initiating a reaction with an alkylating, acylating or sulfonating agent.
Claim 6
Independent Claim
56 words
A method of modifying a surface of a soft contact lens which makes it resistant to soiling, said method comprising (a) treatment of the surface of an unhydrated lens with a strong base in a non-swelling solvent to produce anionic groups on the surface; and (b) initiating a reaction with an alkylating, acylating or sulfonating agent.
Claim 7
Dependent Claim
17 words
The method of claim 4 wherein the strong base is potassium t-butoxide, sodium methoxide or butyl lithium.
Claim 8
Dependent Claim
19 words
The method of claim 4 wherein the reaction agent is neodecanoyl chloride, butane sultone, propane sultone or pivaloyl chloride.
Claim 9
Dependent Claim
24 words
The method of claim 4 wherein the time of the reaction is 1 to 245 hours and the temperature is ambient to 100° C.
Claim 10
Dependent Claim
13 words
A contact lens made resistant to soiling by the method of claim 4.
References Cited (Backward Citations)
US4411932A
Cited
US4442141A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-10 | 1989-08-12 | 1990-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-10 | 1993-08-12 | 1994-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-10 | 1997-08-12 | 1998-02-11 | $7700.00 | Window Closed / Lapsed |