US3926892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic contact lenses and lens polymer
Assignee: Burton Parsons Chemicals Inc
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Filing: 1974-06-06
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Granted: 1975-12-16
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Expires: 1994-06-06
Abstract
Abstract A superior hydrophilic gel polymer and contact lenses therefrom are formed by bulk polymerization of hydroxyethyl methacrylate, 5 to 15 weight percent iso-butyl methacrylate, 1 to 5 weight percent cyclohexyl methacrylate, and about 0.01 to 0.50 weight percent trimethylolpropane trimethacrylate.
Inventors
- 👤 Jr Frank O Holcombe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:35
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/26; C08F220/28; G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
47 words
A HYDROPHILIC GEL POLYMER CONSISTING ESSENTIALLY OF THE ADDITION COPOLYMER OF HYDROXYETHYL METHACRYLATE AND, BASED ON THE WEIGHT OF SAID HYDROXYETHYL METHACRYLATE, ABOUT 5 TO 15 WEIGHT PERCENT ISO-BUTYL METHACRYLATE, ABOUT 1 TO 5 WEIGHT PERCENT CYCLOHEXYL METHACRYLATE, AND ABOUT 0.01 TO 0.50 WEIGHT PERCENT TRIMETHYLOPROPANE TRIMETHACRYLATE.
Claim 2
Dependent Claim
47 words
A HYDROPHILIC GEL POLYMER CONSISTING ESSENTIALLY OF THE ADDITION COPOLYMER OF HYDROXYETHYL METHACRYLATE AND, BASED ON THE WEIGHT OF SAID HYDROXYETHYL METHACRYLATE, ABOUT 5 TO 15 WEIGHT PERCENT ISO-BUTYL METHACRYLATE, ABOUT 1 TO 5 WEIGHT PERCENT CYCLOHEXYL METHACRYLATE, AND ABOUT 0.01 TO 0.50 WEIGHT PERCENT TRIMETHYLOPROPANE TRIMETHACRYLATE.
Claim 3
Dependent Claim
14 words
The polymer of claim 1 wherein said iso-butyl methacrylate is about 10 weight percent.
Claim 4
Dependent Claim
14 words
The polymer of claim 1 wherein said cyclohexyl methacrylate is about 4 weight percent.
Claim 5
Dependent Claim
14 words
The polymer of claim 1 wherein said trimethylolpropane trimethacrylate is about 0.136 weight percent.
Claim 6
Dependent Claim
24 words
A hydrophilic gel polymer contact lens comprising a hydrated gel of the polymer of claim 1 containing about 30 to 40 weight percent water.
Claim 7
Dependent Claim
15 words
The lens of claim 5 wherein said hydrated gel contains about 35 weight percent water.
Claim 8
Dependent Claim
34 words
The lens of claim 5 wherein said polymer is machined and polished to a hydratable lens form allowing for about 18 percent linear expansion and thereafter hydrated to contain about 35 weight percent water.
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) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |