US3772832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing contact lenses
Assignee: Individual
•
Filing: 1972-08-16
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Granted: 1973-11-20
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Expires: 1992-08-16
Abstract
Abstract Contact lens manufacture wherein a semifinished lens or blank having the desired base curve is mounted for axial rotation and its concave side formed with a plurality of peripheral surfaces or curves having slightly different radii of curvature, each being greater than that of the base curve, and juncture line removal tools are presented having radii of curvature each between that of an adjacent pair of peripheral curves to effect juncture line removal.
Inventors
- 👤 J Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:20
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/0025
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
424 words
In the method of manufacturing contact lenses, the steps which comprise: providing a semifinished lens having a desired base curve, supporting said lens for axial rotation with its concave side exposed, presenting to the concave side of said lens a first rotary grinding tool having a curvature of greater radius than that of said base curve to grind a first annular peripheral curve on said lens and leave a predetermined base curve diameter, presenting to the concave side of said lens a second rotary grinding tool having a curvature of radius between that of said first rotary grinding tool and said base curve to grind a second annular peripheral curve on said lens and leave a predetermined base curve diameter, presenting to the concave side of said leNs at least one additional rotary grinding tool having a curvature of radius between that of the preceding grinding tool and said base curve to grind at least one additional annular peripheral curve on said lens and leave a predetermined base curve diameter, presenting to said concave lens side a first rotary polishing tool having approximately the same curvature as said first grinding tool to polish said first peripheral curve, presenting to said concave lens side a second rotary polishing tool having approximately the same curvature as said second grinding tool to polish said second peripheral curve, presenting to said concave lens side at least one additional rotary polishing tool having approximately the same curvature as said one additional grinding tool to polish said one additional peripheral curve, holding said lens against rotation with its concave side exposed, presenting to said concave lens side a first rotary juncture line removal polishing tool having a radius of curvature between that of said first and second grinding tools while maintaining said lens coaxial with said last mentioned polishing tool to more effectively blend the juncture of said first and second peripheral curves, presenting to said concave lens a second rotary juncture line removal polishing tool having a radius of curvature between that of said second and additional grinding tools while maintaining said lens coaxial with said last mentioned polishing tool to more effectively blend the juncture of said second and additional peripheral curves, and presenting to said concave lens side at least one additional rotary juncture line removal polishing tool having a radius of curvature between that of said additional grinding tool and base curve while maintaining said lens coaxial with said last mentioned polishing tool to more effectively blend the juncture of said additional peripheral and base curves.
Claim 2
Dependent Claim
424 words
In the method of manufacturing contact lenses, the steps which comprise: providing a semifinished lens having a desired base curve, supporting said lens for axial rotation with its concave side exposed, presenting to the concave side of said lens a first rotary grinding tool having a curvature of greater radius than that of said base curve to grind a first annular peripheral curve on said lens and leave a predetermined base curve diameter, presenting to the concave side of said lens a second rotary grinding tool having a curvature of radius between that of said first rotary grinding tool and said base curve to grind a second annular peripheral curve on said lens and leave a predetermined base curve diameter, presenting to the concave side of said leNs at least one additional rotary grinding tool having a curvature of radius between that of the preceding grinding tool and said base curve to grind at least one additional annular peripheral curve on said lens and leave a predetermined base curve diameter, presenting to said concave lens side a first rotary polishing tool having approximately the same curvature as said first grinding tool to polish said first peripheral curve, presenting to said concave lens side a second rotary polishing tool having approximately the same curvature as said second grinding tool to polish said second peripheral curve, presenting to said concave lens side at least one additional rotary polishing tool having approximately the same curvature as said one additional grinding tool to polish said one additional peripheral curve, holding said lens against rotation with its concave side exposed, presenting to said concave lens side a first rotary juncture line removal polishing tool having a radius of curvature between that of said first and second grinding tools while maintaining said lens coaxial with said last mentioned polishing tool to more effectively blend the juncture of said first and second peripheral curves, presenting to said concave lens a second rotary juncture line removal polishing tool having a radius of curvature between that of said second and additional grinding tools while maintaining said lens coaxial with said last mentioned polishing tool to more effectively blend the juncture of said second and additional peripheral curves, and presenting to said concave lens side at least one additional rotary juncture line removal polishing tool having a radius of curvature between that of said additional grinding tool and base curve while maintaining said lens coaxial with said last mentioned polishing tool to more effectively blend the juncture of said additional peripheral and base curves.
Claim 3
Dependent Claim
28 words
The method of manufacturing contact lenses according to claim 1, further characterized in presenting said rotary grinding tools which have radii of curvature differing by approximately 0.5 mm.
Claim 4
Dependent Claim
27 words
The method of manufacturing contact lenses according to claim 2, further characterized in grinding successive peripheral curves to successively reduce the base curve diameter approximately 0.1 mm.
References Cited (Backward Citations)
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US3087284A
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US3238676A
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US3360889A
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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) | 1976-11-19 | 1977-05-21 | 1977-11-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-19 | 1981-05-21 | 1981-11-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-19 | 1985-05-21 | 1985-11-20 | $7700.00 | Window Closed / Lapsed |