US4414694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intra-ocular lenses
Assignee: Individual
•
Filing: 1982-10-18
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Granted: 1983-11-15
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Expires: 2002-10-18
Abstract
Abstract An intra-ocular lens which is formed entirely of a polysulfone plastics material. This material is capable of being worked to produce a lens of optical quality, has a refractive index in excess of 1.55 and is capable of being autoclaved in steam at a temperature in excess of 110° C.
Inventors
- 👤 David P. Choyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:35
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/04; G02B1/041; A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/16; A61F2/1602; A61F2/1605; G02C; G02C7/00; G02C7/02; G02C7/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
51 words
An intra-ocular lens which is formed entirely of a polysulfone plastics material which is capable of being worked to produce a lens of optical quality, which has a specific gravity in excess of 1.55 and which is capable of being autoclaved in steam at a temperature in excess of 110° C.
Claim 2
Dependent Claim
51 words
An intra-ocular lens which is formed entirely of a polysulfone plastics material which is capable of being worked to produce a lens of optical quality, which has a specific gravity in excess of 1.55 and which is capable of being autoclaved in steam at a temperature in excess of 110° C.
Claim 3
Dependent Claim
41 words
An intra-ocular lens as set forth in claim 1, wherein the polysulfone material is an aromatic polysulfone containing repeating units having the formula: [Ar-SO.sub.2 ] where Ar is a divalent aromatic radical containing at least one unit having the structure: ##STR4##
Claim 4
Dependent Claim
26 words
An intra-ocular lens as set forth in claim 2, wherein the polysulphone material is composed of repeating units of the structure: ##STR5## where n=10 to 500.
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) | 1986-11-14 | 1987-05-16 | 1987-11-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-14 | 1991-05-16 | 1991-11-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-14 | 1995-05-16 | 1995-11-15 | $7700.00 | Window Closed / Lapsed |