Patent US3791722A successfully refreshed from Google Patents.
US3791722A
Expired / Lapsed
US
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Lenses
Assignee: 3M Co
•
Filing: 1972-01-12
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Granted: 1974-02-12
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Expires: 1992-01-12
Abstract
Abstract Lenses are provided having a central sight zone embracing the field of view and at least an upper shading or shielding zone of lower transmittance arcing around the clear central zone so as to provide shading from above and the sides. A further amount of shading may be provided below the clear portion. Shading and lower transmittance are most advantageously provided by louvered film. The lenses are particularly adapted for skiing goggles.
Inventors
- 👤 C Ahlberg
- 👤 J Drongeson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 12:31
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/16; G02C7/10; G02C7/105
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
68 words
A lens comprising an upper generally arcuate zone of lower transmittance composed of louvered sheet material and a sight zone encompassing the angle of vision said lens adapted for engagement in a wraparound frame having an upper louvered zone extending upward from a curve extending between points near the ends approximately opposite the temples and passing above the eyes at points approximately opposite the eyebrows or frontal eminences.
Claim 2
Dependent Claim
68 words
A lens comprising an upper generally arcuate zone of lower transmittance composed of louvered sheet material and a sight zone encompassing the angle of vision said lens adapted for engagement in a wraparound frame having an upper louvered zone extending upward from a curve extending between points near the ends approximately opposite the temples and passing above the eyes at points approximately opposite the eyebrows or frontal eminences.
Claim 3
Dependent Claim
23 words
A lens according to claim 1 wherein the upper louvered zone is bounded by a straight line between points approximately above the eyes.
Claim 4
Dependent Claim
10 words
A lens according to claim 1 having a concave shape.
Claim 5
Dependent Claim
17 words
A lens according to claim 1 having a planar configuration and being reversibly engagible in the frame.
Claim 6
Dependent Claim
14 words
A lens according to claim 1 in which the louvered zones are in colors.
Claim 7
Dependent Claim
24 words
A lens according to claim 1 additionally including louvered shielding extending from the lateral lower points of the upper louvered zone below each eye.
Claim 8
Dependent Claim
17 words
A lens according to claim 6 having a planar configuration and being reversibly engagible to the frame.
Claim 9
Dependent Claim
11 words
A lens according to claim 7 wherein the louvers are colored.
Claim 10
Dependent Claim
30 words
A lens according to claim 1 in combination with second lens having a mirror image relationship thereto and together providing sight zones substantially embracing the entire normal field of vision.
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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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |