Patent US4405216A successfully refreshed from Google Patents.
US4405216A
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Glare susceptibility tester
Assignee: KOWA OPTIMED Co Ltd
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Filing: 1981-05-20
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Granted: 1983-09-20
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Expires: 2001-05-20
Abstract
Abstract An apparatus for testing glare susceptibility of a subject. A planar member having an opaque target is surrounded by a contrasting surface which is surrounded by a translucent surface. Light is directed to one side of the planar member and the subject's ability to see the target against the contrasting surface against a glare of light through the translucent surface determines the glare susceptibility of the subject.
Inventors
- 👤 M. Princeton Nadler
- 👤 David Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:37
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/02; A61B3/028; A61B3/032; A61B3/06; A61B3/063
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
114 words
A glare susceptibility testing device comprising: a a plurality of planar members each member having: (i) a target image approximately centrally located on its surface; (ii) a contrasting surface adjacently surrounding the target image and which provides a contrast with the target when light is directed to the target and the contrasting surface, each contrasting surface of each member varies from the contrasting surface of the other members; and (iii) a translucent surface adjacently surrounding the contrasting surface; and b. means supporting the planar member and directing light through the planar member to produce an image of the target and contrasting surface which is totally surrounded by a glare source produced by the light.
Claim 2
Dependent Claim
114 words
A glare susceptibility testing device comprising: a a plurality of planar members each member having: (i) a target image approximately centrally located on its surface; (ii) a contrasting surface adjacently surrounding the target image and which provides a contrast with the target when light is directed to the target and the contrasting surface, each contrasting surface of each member varies from the contrasting surface of the other members; and (iii) a translucent surface adjacently surrounding the contrasting surface; and b. means supporting the planar member and directing light through the planar member to produce an image of the target and contrasting surface which is totally surrounded by a glare source produced by the light.
Claim 3
Dependent Claim
17 words
A glare susceptibility testing device as recited in claim 1 wherein the target image is essentially opaque.
Claim 4
Dependent Claim
26 words
A glare susceptibility device as recited in claim 2 wherein the target is a Landolt ring which varies in orientation among the plurality of panel members.
Claim 5
Dependent Claim
44 words
A glare susceptibility testing device as recited in claim 3 wherein the Landolt ring has a diameter of 0.9 cm. and the contrast surface spans a distance in one direction of 3 cm. and the translucent surface spans an area of 16 cm.×23 cm.
References Cited (Backward Citations)
US1780291A
Cited
US3684355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |