Patent US4113686A successfully refreshed from Google Patents.
US4113686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic contact lenses and lens polymer
Assignee: Alcon Vision LLC
•
Filing: 1977-06-09
•
Granted: 1978-09-12
•
Expires: 1997-06-09
Abstract
Abstract A superior hydrophilic gel polymer and contact lenses therefrom are formed by bulk polymerization of about 100 parts by volume of hydroxyethyl methacrylate, 10 parts by volume of isobutyl methacrylate, 0.136 parts by volume of trimethylolpropane trimethacrylate, 1.35 parts by volume of methacrylic acid in the presence of 0.25 parts by volume of 2,5 dimethyl 2,5 bis (2-ethyl hexoyl peroxy) hexane at a temperature of about 65° C to produce a material which, when hydrated, exhibits a water content of about 43% and a linear expansion of about 22%.
Inventors
- 👤 Frank O. Holcombe, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:38
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/20; Y; Y10; Y10S; Y10S526/00; Y10S526/93; Y10S526/936
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
47 words
A hydrophilic gel polymer consisting of the addition copolymer of about the following in parts of volume: 2-hydroxethyl methacrylate -- 100 parts isobutyl methacrylate -- 10 parts trimethylolpropane trimethyacrylate -- 0.136 parts methacrylic acid -- 1.35 parts 2,5 dimethyl 2,5 bis(2-ethyl hexoyl peroxy) hexane -- 0.25 parts.
Claim 2
Dependent Claim
47 words
A hydrophilic gel polymer consisting of the addition copolymer of about the following in parts of volume: 2-hydroxethyl methacrylate -- 100 parts isobutyl methacrylate -- 10 parts trimethylolpropane trimethyacrylate -- 0.136 parts methacrylic acid -- 1.35 parts 2,5 dimethyl 2,5 bis(2-ethyl hexoyl peroxy) hexane -- 0.25 parts.
Claim 3
Dependent Claim
22 words
A hydrophilic gel polymer contact lens comprising a hydrated gel of the polymer of claim 1 containing about 43 weight percent water.
Claim 4
Dependent Claim
34 words
The lens of claim 2 wherein said polymer is machined and polished to a hydratable lens form allowing for about 22 percent linear expansion and thereafter hydrated to contain about 43 weight percent water.
References Cited (Backward Citations)
US3850892A
Cited
US3948841A
Cited
US3985697A
Cited
US3937680A
Cited
US3983083A
Cited
US3944637A
Cited
US3988274A
Cited
US3926892A
Cited
US3965063A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-09-11 | 1982-03-13 | 1982-09-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-09-11 | 1986-03-13 | 1986-09-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-09-11 | 1990-03-13 | 1990-09-12 | $7700.00 | Window Closed / Lapsed |