Patent US4297008A successfully refreshed from Google Patents.
US4297008A
Expired / Lapsed
US
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Method and apparatus for making a non spherical beveled contact lens
Assignee: PRECISION OPTICS Inc
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Filing: 1979-01-16
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Granted: 1981-10-27
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Expires: 1999-01-16
Abstract
Abstract An improved contact lens with a truly non-spherical bevel is disclosed, along with a method and apparatus for making same. Lenses, including the theoretically perfect "ski" periphery are consistently produced and reproduced by bringing the posterior surface of the unfinished lens into contact with a rotating abrasive coated working surface. The working surface or tool is size selected to match the unfinished lens and desired fitting dimensions. The working surface is formed on a tool body having a central axis and having a smooth three-dimensional curvilinear surface configuration generated by the rotation of an S-shaped curve produced by the circumferential arcs of two tangential conic-section curves about the central axis.
Inventors
- 👤 Donald L. Woodford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:27
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/0025
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
111 words
A method of producing a non-spherical bevel on the posterior surface of a contact lens comprising the steps of: providing a rotatably mounted working surface having a central axis about which said working surface is symmetrical, said working surface further having a smooth three-dimensional curvilinear surface configuration generated by the rotation of an S-shaped curve produced by the circumferential arcs of two tantential conic-section curves about said central axis; providing an abrasive material on said working surface; rotating said working surface about said central axis; and bringing the posterior surface of the contact lens into contact with said working surface to selectively abrade away portions of the posterior peripheral surface thereof.
Claim 2
Independent Claim
111 words
A method of producing a non-spherical bevel on the posterior surface of a contact lens comprising the steps of: providing a rotatably mounted working surface having a central axis about which said working surface is symmetrical, said working surface further having a smooth three-dimensional curvilinear surface configuration generated by the rotation of an S-shaped curve produced by the circumferential arcs of two tantential conic-section curves about said central axis; providing an abrasive material on said working surface; rotating said working surface about said central axis; and bringing the posterior surface of the contact lens into contact with said working surface to selectively abrade away portions of the posterior peripheral surface thereof.
Claim 3
Dependent Claim
93 words
Apparatus for producing a non-spherical bevel on the posterior surface of a contact lens by rotationally abrading the lens, the apparatus comprising: a body portion with a central axis and a working surface, said working surface being substantially symmetrical about said central axis and having a smooth three-dimensional curvilinear configuration generated by the rotation of an S-shaped curve produced by the circumferential arcs of two tangential conic-section curves about said central axis and means on said body portion in axial alignment with said central axis for affixing said body portion to rotation means.
Claim 4
Dependent Claim
93 words
Apparatus for producing a non-spherical bevel on the posterior surface of a contact lens by rotationally abrading the lens, the apparatus comprising: a body portion with a central axis and a working surface, said working surface being substantially symmetrical about said central axis and having a smooth three-dimensional curvilinear configuration generated by the rotation of an S-shaped curve produced by the circumferential arcs of two tangential conic-section curves about said central axis and means on said body portion in axial alignment with said central axis for affixing said body portion to rotation means.
Claim 5
Dependent Claim
13 words
The apparatus of claim 2 wherein: said body portion comprises a rigid material.
Claim 6
Dependent Claim
15 words
The apparatus of claim 2 wherein: said working surface is substantially circular in cross section.
Claim 7
Dependent Claim
24 words
The apparatus of claim 2 wherein: said working surface is in the range of from about 5 mm. to about 12 mm. in diameter.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |