US4416837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spin casting of contact lenses
Assignee: Sunsoft Corp
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Filing: 1982-09-13
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Granted: 1983-11-22
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Expires: 2002-09-13
Abstract
Abstract A simplified method of making spin cast contact lenses having front and back aspheric surfaces and no effective refractive aspherosity when in place on a spherical cornea.
Inventors
- 👤 Charles W. Neefe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:47
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00009; B29D11/0048; B29D11/00519; B29C; B29C41/00; B29C41/02; B29C41/04; B29C41/042; B29C41/045; B29D11/00019; G; G02; G02C; G02C7/00; G02C7/02; G02C7/04; G02C7/046; B29L; B29L2011/00; B29L2011/0016; B29L2011/0041; B29L2031/00; B29L2031/76; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
169 words
A method of spin casting contact lenses having equal amounts of aspherosity on both the concave and convex lens surfaces and having no aspherosity when in place on a spherical cornea by the steps providing a concave spin casting mold, placing a selected liquid monomer in the concave mold, rotating the concave mold and the selected liquid monomer at a selected speed to form an aspheric concave surface on the selected liquid monomer, allowing the selected liquid monomer to polymerize to form a solid aspheric optical surface, adhering to the concave mold, adding a liquid lens monomer to the concave aspheric mold and rotating the aspheric surfaced lens mold and the selected lens monomer at the selected speed to form a concave aspheric surface on the liquid lens monomer and a convex aspheric lens surface formed against the aspheric concave mold, allowing the rotating liquid lens monomer to polymerize to form a lens having an aspheric concave and convex surface, removing the aspheric lens from the aspheric concave mold.
Claim 2
Independent Claim
169 words
A method of spin casting contact lenses having equal amounts of aspherosity on both the concave and convex lens surfaces and having no aspherosity when in place on a spherical cornea by the steps providing a concave spin casting mold, placing a selected liquid monomer in the concave mold, rotating the concave mold and the selected liquid monomer at a selected speed to form an aspheric concave surface on the selected liquid monomer, allowing the selected liquid monomer to polymerize to form a solid aspheric optical surface, adhering to the concave mold, adding a liquid lens monomer to the concave aspheric mold and rotating the aspheric surfaced lens mold and the selected lens monomer at the selected speed to form a concave aspheric surface on the liquid lens monomer and a convex aspheric lens surface formed against the aspheric concave mold, allowing the rotating liquid lens monomer to polymerize to form a lens having an aspheric concave and convex surface, removing the aspheric lens from the aspheric concave mold.
Claim 3
Dependent Claim
17 words
A method as in claim 1 wherein the curvature of the concave and convex surfaces are different.
Claim 4
Dependent Claim
22 words
A method as in claim 1 wherein the radius of the concave surface is shorter than the radius of the convex surface.
Claim 5
Dependent Claim
22 words
A method as in claim 1 wherein the radius of the concave surface is longer than the radius of the convex surface.
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) | 1986-11-21 | 1987-05-23 | 1987-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-21 | 1991-05-23 | 1991-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-21 | 1995-05-23 | 1995-11-22 | $7700.00 | Window Closed / Lapsed |