Patent US4847486A successfully refreshed from Google Patents.
US4847486A
Expired / Lapsed
US
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Electro-optical alertness monitoring apparatus
Assignee: SAAT Ltd
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Filing: 1988-03-02
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Granted: 1989-07-11
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Expires: 2008-03-02
Abstract
Abstract Apparatus for monitoring the eye of a subject comprising: apparatus for directing infra-red radiation at the eyes of a subject; apparatus for sensing infra-red radiation retroreflected by the retina through the cornea of the subject; and apparatus for providing a sensible output indication in the absence of expected received retroreflected radiation, indicating the closing of the subject's eyes or direction of his eyes outside of a desired angular region.
Inventors
- 👤 Dan Moran
- 👤 Yonatan Gerlitz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 03:26
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/113; A61B5/00; A61B5/103; A61B5/11; A61B5/1103; A61B2503/00; A61B2503/20; A61B2503/22; A61B2562/00; A61B2562/02; A61B2562/0233; A61B5/68; A61B5/6801; A61B5/6813; A61B5/6814; A61B5/6821; A61B5/6887; A61B5/6893
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
76 words
Apparatus for monitoring the eye of a subject comprising: means for directing radiation at the eyes of a subject; means for sensing radiation retroreflected by the retina through the cornea of an eye of the subject; scanning means for causing said means for directing and said means for sensing to scan a given angular region in at least one direction; and means for providng a sensible output indication in the absence of expected received retroreflected radiation.
Claim 2
Dependent Claim
76 words
Apparatus for monitoring the eye of a subject comprising: means for directing radiation at the eyes of a subject; means for sensing radiation retroreflected by the retina through the cornea of an eye of the subject; scanning means for causing said means for directing and said means for sensing to scan a given angular region in at least one direction; and means for providng a sensible output indication in the absence of expected received retroreflected radiation.
Claim 3
Dependent Claim
14 words
Apparatus according to claim 1 and wherein said radiation is outside the visible spectrum.
Claim 4
Dependent Claim
12 words
Apparatus according to claim 1 and wherein said radiation is infrared radiation.
Claim 5
Dependent Claim
12 words
Apparatus according to claim 2 and wherein said radiation is infrared radiation.
Claim 6
Dependent Claim
18 words
Apparatus according to claim 1 and wherein said scanning means are operative to scan in two orthogonal directions.
Claim 7
Dependent Claim
18 words
Apparatus according to claim 2 and wherein said scanning means are operative to scan in two orthogonal directions.
Claim 8
Dependent Claim
18 words
Apparatus according to claim 1 and wherein said scanning means are operative to scan in a horizontal plane.
Claim 9
Dependent Claim
18 words
Apparatus according to claim 2 and wherein said scanning means are operative to scan in a horizontal plane.
Claim 10
Dependent Claim
15 words
Apparatus according to claim 1 and wherein said means for directing comprise a collimating lens.
Claim 11
Dependent Claim
15 words
Apparatus according to claim 2 and wherein said means for directing comprise a collimating lens.
Claim 12
Dependent Claim
15 words
Apparatus according to claim 3 and wherein said means for directing comprise a collimating lens.
Claim 13
Dependent Claim
15 words
Apparatus according to claim 4 and wherein said means for directing comprise a collimating lens.
Claim 14
Dependent Claim
15 words
Apparatus according to claim 5 and wherein said means for directing comprise a collimating lens.
Claim 15
Dependent Claim
19 words
Apparatus according to claim 1 and wherein said means for sensing comprise a beam splitter and an infra-red detector.
Claim 16
Dependent Claim
19 words
Apparatus according to claim 2 and wherein said means for sensing comprise a beam splitter and an infra-red detector.
Claim 17
Dependent Claim
47 words
Apparatus according to claim 1 and wherein said means for providing include circuitry receiving inputs representing the timing of radiation outputs from said means for directing and inputs representing the timing of retroreflected radiation received by said means for sensing, for providing an alarm actuation output signal.
Claim 18
Dependent Claim
47 words
Apparatus according to claim 2 and wherein said means for providing include circuitry receiving inputs representing the timing of radiation outputs from said means for directing and inputs representing the timing of retroreflected radiation received by said means for sensing, for providing an alarm actuation output signal.
Claim 19
Dependent Claim
44 words
Apparatus according to claim 1 and wherein said means for providing an sensible output indication in the absence of expected received retroreflected radiation is operative for indicating the closing of the operator's eyes or direction of his eyes outside of a desired angular region.
Claim 20
Dependent Claim
44 words
Apparatus according to claim 2 and wherein said means for providing an sensible output indication in the absence of expected received retroreflected radiation is operative for indicating the closing of the operator's eyes or direction of his eyes outside of a desired angular region.
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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) | 1992-07-10 | 1993-01-09 | 1993-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-10 | 1997-01-09 | 1997-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-10 | 2001-01-09 | 2001-07-11 | $7700.00 | Window Closed / Lapsed |