Patent US5327181A successfully refreshed from Google Patents.
US5327181A
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Progressive lens for specialty and occupational use
Assignee: Gentex Optics Inc
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Filing: 1993-01-12
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Granted: 1994-07-05
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Expires: 2013-01-12
Abstract
Abstract A progressive addition lens constructed on the bipolar principle in accordance with a power law having a steeper slope or gradient in the regions adjacent to the poles than in the middle region thereof between the poles.
Inventors
- 👤 Richard P. Waido
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:26
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/02; G02C7/06; G02C7/061; G02C7/024; G02C7/028
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
A lens having near vision and far vision poles and a progressive surface between said poles, said progressive surface having regions adjacent to said poles and a middle region between said poles and having a power law which provides power gradients in said regions adjacent to the poles which are relatively steep as contrasted with relatively gradual power gradients in said middle region thereof between said poles.
Claim 2
Dependent Claim
67 words
A lens having near vision and far vision poles and a progressive surface between said poles, said progressive surface having regions adjacent to said poles and a middle region between said poles and having a power law which provides power gradients in said regions adjacent to the poles which are relatively steep as contrasted with relatively gradual power gradients in said middle region thereof between said poles.
Claim 3
Dependent Claim
45 words
A lens as in claim 1 having a vertical principle meridian and in which the power law has the formula P=7-Y/19+0.104e.sup.1.44(Y/19).sup.2 sin(πY/19) where P is optical power in diopters and Y is a Cartesian coordinate whose axis is the vertical principal meridian of the lens.
Claim 4
Dependent Claim
15 words
A lens as in claim 1 having a maximum surface astigmatism of about 0.44 D.
Claim 5
Dependent Claim
15 words
A lens as in claim 1 having an average surface astigmatism of about 0.21 D.
Claim 6
Dependent Claim
64 words
A lens as in claim 1 having a peak surface astigmatism and in which the power law has the formula P=7-(1-K) (Y/19)-K(Y/19).sup.N where P is optical power in diopters, Y is a Cartesian coordinate whose axis is the vertical principal meridian of the lens, N is an odd positive integer and K is a constant which minimizes the peak surface astigmatism of the lens.
Claim 7
Dependent Claim
27 words
A lens as in claim 5 in which N is 7 and K is 0.3189 to give a peak surface astigmatism for the lens of 0.443 diopter.
Claim 8
Dependent Claim
27 words
A lens as in claim 5 in which N is 9 and K is 0.3409 to give a peak surface astigmatism for the lens of 0.429 diopter.
Claim 9
Dependent Claim
27 words
A lens as in claim 5 in which N is 11 and K is 0.3550 to give a peak surface astigmatism for the lens of 0.420 diopter.
Claim 10
Dependent Claim
27 words
A lens as in claim 5 in which N is 13 and K is 0.3644 to give a peak surface astigmatism for the lens of 0.414 diopter.
Claim 11
Dependent Claim
27 words
A lens as in claim 5 in which N is 15 and K is 0.3723 to give a peak surface astigmatism for the lens of 0.409 diopter.
Claim 12
Dependent Claim
60 words
A lens having near vision and far vision poles and a progressive surface between said poles, said progressive surface having regions adjacent to said poles and a middle region between said poles and having a power law which provides a power gradient in the region adjacent to one of the poles than in said middle region of said progressive surface.
Claim 13
Dependent Claim
60 words
A lens having near vision and far vision poles and a progressive surface between said poles, said progressive surface having regions adjacent to said poles and a middle region between said poles and having a power law which provides a power gradient in the region adjacent to one of the poles than in said middle region of said progressive surface.
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) | 1997-07-04 | 1998-01-03 | 1998-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-07-04 | 2002-01-03 | 2002-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-07-04 | 2006-01-03 | 2006-07-05 | $7700.00 | Window Closed / Lapsed |