US4524419A
Expired / Lapsed
US
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System for determining the optimal ground depth of an ophthalmic lens having a closed homeomorphic boundary
Assignee: INTELAB MEDICAL SYSTEMS Inc
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Filing: 1982-09-13
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Granted: 1985-06-18
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Expires: 2002-09-13
Abstract
Abstract The minimum edge thickness boundary of an ophthalmic lens is mathematically projected onto a plane containing a scaled image of the spectacle frame while the ground depth of the lens is dynamically varied to obtain circumscription with the image. Optimal tool settings are then determined which will result in a ground prescription lens having minimum overall thickness.
Inventors
- 👤 Larry M. Headlund
- 👤 Gary J. Marksteiner
- 👤 Richard S. Sidell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:44
CPC Classifications
B; B24; B24B; B24B13/00; B24B13/06; B24B17/00; B24B17/04; G; G02; G02C; G02C13/00; G02C13/003
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
A system for determining the optimal ground depth of an ophthalmic lens having a closed homeomorphic boundary, comprising: means for graphically projecting an orbit of the prescribed lens; means for superimposing a projection of a spectacle frame onto the graphical projection of said orbit; and means for dynamically adjusting said orbit to circumscribe the projection of said spectacle frame.
Claim 2
Independent Claim
59 words
A system for determining the optimal ground depth of an ophthalmic lens having a closed homeomorphic boundary, comprising: means for graphically projecting an orbit of the prescribed lens; means for superimposing a projection of a spectacle frame onto the graphical projection of said orbit; and means for dynamically adjusting said orbit to circumscribe the projection of said spectacle frame.
Claim 3
Dependent Claim
28 words
The system of claim 1 further including means for determining the optimal lens thickness and means for calculating the final tool settings to obtain that optimal lens thickness.
Claim 4
Independent Claim
53 words
A method of determining the optimal ground depth of an ophthalmic lens having a closed homeomorphic boundary, comprising: graphically projecting an orbit of the prescribed lens; superimposing a projection of a spectacle frame onto the graphical projection of said orbit; and dynamically adjusting said orbit to circumscribe the projection of said spectacle frame.
Claim 5
Independent Claim
53 words
A method of determining the optimal ground depth of an ophthalmic lens having a closed homeomorphic boundary, comprising: graphically projecting an orbit of the prescribed lens; superimposing a projection of a spectacle frame onto the graphical projection of said orbit; and dynamically adjusting said orbit to circumscribe the projection of said spectacle frame.
Claim 6
Dependent Claim
24 words
The method of claim 3 further including determining the optical lens thickness and calculating the final tool settings to obtain that optimal lens thickness.
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) | 1988-06-17 | 1988-12-17 | 1989-06-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-17 | 1992-12-17 | 1993-06-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-17 | 1996-12-17 | 1997-06-18 | $7700.00 | Window Closed / Lapsed |