US3871813A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mold member for contact lens construction
Assignee: Barnes Hind Inc
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Filing: 1973-04-09
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Granted: 1975-03-18
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Expires: 1993-04-09
Abstract
Abstract A mold member for molding the inner surface of a plastic contact lens formed by moving the flat end face of a metal blank to a starting position in tangential engagement with the axially straight peripheral edge of a grinding wheel and then simultaneously turning the blank and the grinding wheel about their respective axes of rotation while swinging the blank through a predetermined angle about an axis normal to and intersecting the axis of rotation of the blank.
Inventors
- 👤 Quido A Cappeli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 07:26
CPC Classifications
B; B24; B24B; B24B11/00; B24B13/00; B24B19/00; B29; B29D; B29D11/00; B29D11/00932; Y; Y10; Y10S; Y10S425/00; Y10S425/808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
149 words
A mold for forming the inner surface of a plastic cornealtype contact lens such that the inner surface includes a semispherical central cornea engaging portion and a slightly concave outer annular cornea engaging and limbus bridging portion, said mold comprising: a mold member having an end face including a central semispherical convex portion of radius r1 having substantially the contour of the central portion of the cornea and an outer slightly concave annular portion forming the periphery of said end face and of radius r2 greater than and colinear to r1, and a junction of curves defined by r1 and r2 defining a surface having substantially the contour of the outer annular generally hyperbolic portion of the cornea and bridging the limbus just to the sclera of the eye, the diameter of said portion of radius r1 being of the order of one-half the diameter of said end face.
Claim 2
Dependent Claim
149 words
A mold for forming the inner surface of a plastic cornealtype contact lens such that the inner surface includes a semispherical central cornea engaging portion and a slightly concave outer annular cornea engaging and limbus bridging portion, said mold comprising: a mold member having an end face including a central semispherical convex portion of radius r1 having substantially the contour of the central portion of the cornea and an outer slightly concave annular portion forming the periphery of said end face and of radius r2 greater than and colinear to r1, and a junction of curves defined by r1 and r2 defining a surface having substantially the contour of the outer annular generally hyperbolic portion of the cornea and bridging the limbus just to the sclera of the eye, the diameter of said portion of radius r1 being of the order of one-half the diameter of said end face.
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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |