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Patent US4655774A successfully refreshed from Google Patents.
US4655774A
Expired / Lapsed
US
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Intra-corneal implant for correction of aniridia
Assignee: Individual
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Filing: 1986-03-19
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Granted: 1987-04-07
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Expires: 2006-03-19
Abstract
Abstract The invention relates to an implant intended to act in place of an iris and comprises an opaque part-spherical annulus of an autoclavable plastics material which is inserted between the layers of the cornea. The central clear portion of the implant may be an open aperture or may include a lens to correct for defects in eyesight.
Inventors
- 👤 D. Peter Choyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:58
CPC Classifications
A; A61; A61F; A61F2/00; A61F2/02; A61F2/14; A61F2/145; A61F2/147; A61F9/00; A61F9/007; A61F9/013; A61L; A61L27/00; A61L27/14; A61L27/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
42 words
An intra-corneal implant for correction of aniridia which comprises an opaque disc having a part spherical surface and a central clear portion, the disc being formed of a clinically inert, autoclavable thermoplastic material selected from the group comprising polysulphones, polyethersulphones and polyarylsulphones.
Claim 2
Dependent Claim
42 words
An intra-corneal implant for correction of aniridia which comprises an opaque disc having a part spherical surface and a central clear portion, the disc being formed of a clinically inert, autoclavable thermoplastic material selected from the group comprising polysulphones, polyethersulphones and polyarylsulphones.
Claim 3
Dependent Claim
23 words
An intra-corneal implant according to claim 1 wherein the central clear portion of the implant is formed by an aperture in the disc.
Claim 4
Dependent Claim
19 words
An intra-corneal implant according to claim 1 wherein the clear central portion is formed by a transparent correcting lens.
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) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |