Patent US5116684A successfully refreshed from Google Patents.
US5116684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite ophthalmic lens
Assignee: Corning Inc
•
Filing: 1990-09-28
•
Granted: 1992-05-26
•
Expires: 2010-09-28
Abstract
Abstract An improvement in the epoxy plastic element of a laminated, glass-plastic, ophthalmic lens structure, and a method of effecting the improvement, are disclosed. The improved element is cast from a casting mix in which the ingredients are maintained in certain relationships to each other to provide an optically clear casting essentially free of striations. The cast material is gelled at a low temperature not over about 100° C., and may then be cured at a temperature up to 200° for a period of at least two hours.
Inventors
- 👤 Edward R. Fretz, Jr.
- 👤 Anthony R. Olszewski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:25
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/24; B; B32; B32B; B32B17/00; B32B17/06; B32B17/10; B32B17/10005; B32B17/10009; B32B17/10018; C08L; C08L63/00; C08J2363/00; Y; Y10; Y10S; Y10S428/00; Y10S428/913; Y10T; Y10T428/00; Y10T428/25; Y10T428/31504; Y10T428/31511; Y10T428/31525
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
In a laminated, ophthalmic lens structure comprising an inorganic glass layer and a rigid, organic plastic layer wherein the organic plastic layer is an optically clear, epoxy polymer cast from an aliphatic and/or aromatic epoxide monomer, a curing agent, a source of active hydroxyl groups and an accelerator, and has a predetermined refractive index, the improvement wherein the ratio of curing agent to epoxide, by equivalent weights, is between 2:5 and 5:4, the ratio of curing agent to hydroxyl group source, by equivalent weights, is between 2:1 and 6:1, and the amount of accelerator is at least 0.01%, but not over 1.0%, of the mixture.
Claim 2
Dependent Claim
105 words
In a laminated, ophthalmic lens structure comprising an inorganic glass layer and a rigid, organic plastic layer wherein the organic plastic layer is an optically clear, epoxy polymer cast from an aliphatic and/or aromatic epoxide monomer, a curing agent, a source of active hydroxyl groups and an accelerator, and has a predetermined refractive index, the improvement wherein the ratio of curing agent to epoxide, by equivalent weights, is between 2:5 and 5:4, the ratio of curing agent to hydroxyl group source, by equivalent weights, is between 2:1 and 6:1, and the amount of accelerator is at least 0.01%, but not over 1.0%, of the mixture.
Claim 3
Dependent Claim
20 words
A laminated lens structure in accordance with claim 1 wherein the organic plastic layer has a refractive index of 1.523.
Claim 4
Dependent Claim
21 words
A laminated lens structure in accordance with claim 1 wherein the aliphatic epoxide monomer in the casting mixture is a cycloaliphatic.
Claim 5
Dependent Claim
15 words
A laminated lens structure in accordance with claim 3 wherein the monomer is 3,4-epoxycyclohexylmethyl -3,4-epoxy-cyclohexane-carboxylate.
Claim 6
Dependent Claim
21 words
A laminated lens structure in accordance with claim 1 wherein the aromatic epoxide monomer is a diglycidyl ether of bisphenol A.
Claim 7
Dependent Claim
16 words
A laminated lens structure in accordance with claim 1 wherein the curing agent is an anhydride.
Claim 8
Dependent Claim
16 words
A laminated lens structure in accordance with claim 6 wherein the anhydride is hexahydro phthalic anhydride.
Claim 9
Dependent Claim
22 words
A laminated lens structure in accordance with claim 1 wherein the source of hydroxyl groups in the casting mixture is a polyol.
Claim 10
Dependent Claim
15 words
A laminated lens structure in accordance with claim 8 wherein the polyol is propylene glycol.
Claim 11
Dependent Claim
26 words
A laminated lens structure in accordance with claim 6 wherein the ratio of anhydride to the source of hydroxyl groups, by equivalent weights, is about 5:2.
Claim 12
Dependent Claim
20 words
A laminated lens structure in accordance with claim 1 wherein the accelerator in the casting mixture is a Lewis acid.
Claim 13
Dependent Claim
16 words
A laminated lens structure in accordance with claim 11 wherein the Lewis Acid is tin octoate.
Claim 14
Dependent Claim
22 words
A laminated lens structure in accordance with claim 1 wherein the accelerator does not exceed about 0.1% by weight of the mixture.
Claim 15
Dependent Claim
18 words
A laminated lens structure in accordance with claim 1 wherein the organic plastic layer further comprises a decolorizer.
Claim 16
Dependent Claim
21 words
A laminated lens structure in accordance with claim 1, wherein the organic plastic layer further comprises means for absorbing ultra-violet radiation.
References Cited (Backward Citations)
US4432832A
Cited
US4756972A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-05-26 | 1995-11-25 | 1996-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-05-26 | 1999-11-25 | 2000-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-05-26 | 2003-11-25 | 2004-05-26 | $7700.00 | Window Closed / Lapsed |