Patent US1993797A successfully refreshed from Google Patents.
Patent US3978620A successfully refreshed from Google Patents.
US3978620A
Expired / Lapsed
US
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Apparatus for working the marginal zones of a lens
Assignee: Agfa Gevaert AG
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Filing: 1975-06-13
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Granted: 1976-09-07
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Expires: 1995-06-13
Abstract
Abstract A lens of a soft and readily damaged material is placed onto a support having a surface whose contour corresponds to the mating contour of the juxtaposed surface of the lens. The support is rotated and the lens is shifted on it until the lens is centered on the surface of the support, whereupon suction is applied through the support to the lens to hold it immovable as the marginal zones of the lens are being worked.
Inventors
- 👤 Paul Feneberg
- 👤 Anton Schatz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:07
CPC Classifications
B; B24; B24B; B24B9/00; B24B9/02; B24B9/06; B24B9/08; B24B9/14; B24B9/146; B24B9/142
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
150 words
An apparatus for working marginal zones of a lens -- particularly a contact lens -- which is of soft and readily damaged material and has a curved side bounded by a circumferential marginal portion, comprising a rotatable support having a surface on which the lens is to be placed and which extends transversely through the axis of rotation of said support, said surface having a center portion curved matingly relative to said curved side of said lens and a flattened peripheral portion surrounding said main portion along a junction area therewith; centering means for centering the lens on said surface; means for applying in said junction area suction to said lens so as to draw said marginal portion thereof into contact with said peripheral portion to thereby temporarily flatten and position it for proper working; and working means for working said marginal portion of the lens centered on said surface.
Claim 2
Independent Claim
150 words
An apparatus for working marginal zones of a lens -- particularly a contact lens -- which is of soft and readily damaged material and has a curved side bounded by a circumferential marginal portion, comprising a rotatable support having a surface on which the lens is to be placed and which extends transversely through the axis of rotation of said support, said surface having a center portion curved matingly relative to said curved side of said lens and a flattened peripheral portion surrounding said main portion along a junction area therewith; centering means for centering the lens on said surface; means for applying in said junction area suction to said lens so as to draw said marginal portion thereof into contact with said peripheral portion to thereby temporarily flatten and position it for proper working; and working means for working said marginal portion of the lens centered on said surface.
Claim 3
Dependent Claim
15 words
An apparatus as defined in claim 1, wherein said working means comprises an abrasive element.
Claim 4
Dependent Claim
40 words
An apparatus as defined in claim 1, wherein said centering means comprises a hollow cap which is juxtaposed and coaxial with said surface and movable lengthwise of said axis of said rotation into and out of engagement with said lens.
Claim 5
Dependent Claim
18 words
An apparatus as defined in claim 1, wherein said side is concave and said surface is matingly convex.
Claim 6
Dependent Claim
22 words
An apparatus as defined in claim 1, wherein said suction means comprises openings through which suction can be applied to said lens.
Claim 7
Dependent Claim
25 words
An apparatus as defined in claim 3, wherein said hollow cap has a substantially conically configurated hollow interior and an open side facing said surface.
Claim 8
Dependent Claim
30 words
An apparatus as defined in claim 1, wherein said working means comprises an abrasive element which is substantially composed of fine-grained silica carbonate and an elastomeric binder for the same.
Claim 9
Dependent Claim
12 words
An apparatus as defined in claim 7, wherein said binder is rubber.
Claim 10
Dependent Claim
19 words
An apparatus as defined in claim 7, wherein said abrasive element is mounted for rotation relative to said support.
Claim 11
Dependent Claim
28 words
An apparatus as defined in claim 7, wherein said abrasive element is mounted for rotation relative to said support at peripheral speeds on the order of 40 m/sec.
Claim 12
Independent Claim
92 words
An apparatus for working marginal zones of a lens -- particularly a contact lens -- which is of soft and readily damaged material, comprising a rotatable support having a surface on which the lens is to be placed and which extends transversely through the axis of rotation of said support; centering means for centering the lens on said surface, comprising a bifurcated lens engaging member which is mounted for shifting movement transversely of said axis of rotation and working means for working said marginal zones of the lens centered on said surface.
Claim 13
Independent Claim
92 words
An apparatus for working marginal zones of a lens -- particularly a contact lens -- which is of soft and readily damaged material, comprising a rotatable support having a surface on which the lens is to be placed and which extends transversely through the axis of rotation of said support; centering means for centering the lens on said surface, comprising a bifurcated lens engaging member which is mounted for shifting movement transversely of said axis of rotation and working means for working said marginal zones of the lens centered on said 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) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |