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US4384097A
Expired / Lapsed
US
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Contact lenses of methyl methacrylate copolymers
Assignee: Bayer AG
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Filing: 1980-10-09
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Granted: 1983-05-17
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Expires: 2000-10-09
Abstract
Abstract Contact lenses and contact shells of light-refracting material consisting essentially of a copolymer of (I) from 40 to 90% by weight of methyl methacrylate and (II) from 10 to 60% by weight of methyl acrylate and/or esters corresponding to formula (1): ##STR1## in which R represents H or CH 3 , R' represents H, CH 3 or C 2 H 5 and n=1 or 2, the sum of I and II amounting to 100% by weight.
Inventors
- 👤 Frank Wingler
- 👤 Bernd Leusner
- 👤 Peter Schwabe
- 👤 Otto-Christian Geyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:55
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; G02B1/043; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14; C08F220/26; C08F220/28; C08F220/281
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
87 words
Contact lenses or contact shells of light-refracting material having a glass transition temperature of 40° to 70° C. and consisting essentially of a chemically uniform copolymer (I) from 40 to 90% by weight of methyl methacrylate and (II) from 10 to 60% by weight of methyl acrylate and/or esters corresponding to the formula ##STR3## in which R represents H or CH 3 , R' represents CH 3 or C 2 H 5 and n=1 or 2, the sum of I and II amounting to 100% by weight.
Claim 2
Dependent Claim
87 words
Contact lenses or contact shells of light-refracting material having a glass transition temperature of 40° to 70° C. and consisting essentially of a chemically uniform copolymer (I) from 40 to 90% by weight of methyl methacrylate and (II) from 10 to 60% by weight of methyl acrylate and/or esters corresponding to the formula ##STR3## in which R represents H or CH 3 , R' represents CH 3 or C 2 H 5 and n=1 or 2, the sum of I and II amounting to 100% by weight.
Claim 3
Dependent Claim
23 words
Contact lenses or contact shells as claimed in claim 1 containing as component II methyl acrylate, methoxymethyl acrylate, 2-methoxyethyl methacrylate or 2-ethoxyethyl methacrylate.
Claim 4
Dependent Claim
16 words
Contact lenses or contact shells as claimed in claim 1 containing as component II methyl acrylate.
References Cited (Backward Citations)
US3284394A
Cited
US3503942A
Cited
US3951528A
Cited
US3892721A
Cited
US3850892A
Cited
US4038264A
Cited
US3950314A
Cited
US4028295A
Cited
US4246382A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |