US3574471A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic monitor to determine exposure to laser radiation
Assignee: Kollsman Instrument Corp
•
Filing: 1968-03-08
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Granted: 1971-04-13
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Expires: 1988-03-08
Abstract
Abstract A device for determining the quantity of laser radiation exposed to the eyes or body of an observer in a given period of time. A beam splitter mounted on a spectacle frame directs a small portion of incident laser light to a photosensing device such as a plate of photosensitive film also carried on the frame. A light filter, which has a band pass which passes laser frequencies and blocks the remaining band of the spectrum is supported between the film and the beam splitter. The incident laser radiation is now monitored by the film. When the film is developed, one can determine the total quantity of laser light passing into the eyes or other body portions from the exposure of the film.
Inventors
- 👤 Elliott H Kahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:27
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/48
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
32 words
The combination as set forth in claim 1 wherein said beam splitter is at a 45* angle in relation to the plane of said photosensitive surface and to said line of incidence.
Claim 2
Dependent Claim
23 words
The combination as set forth in claim 1 further comprising a selective light filter positioned between said beam splitter and said photosensitive surface.
Claim 3
Dependent Claim
26 words
The combination as set forth in claim 3 further comprising a convex lens disposed along an optical path between the beam splitter and the photosensitive surface.
Claim 4
Dependent Claim
19 words
The combination as seT forth in claim 1 wherein said light-monitoring means comprises a thin strip of photosensitive material.
Claim 5
Dependent Claim
23 words
The combination as set forth in claim 5 further comprising a selective light filter positioned between said beam splitter and said photosensitive surface.
Claim 6
Dependent Claim
21 words
The combination as set forth in claim 6 wherein said housing contains said light filter and said strip of photosensitive material.
Claim 7
Dependent Claim
31 words
The combination as set forth in claim 6 wherein said main support means comprises a spectacle-type arrangement having first and second earpieces and a nosepiece for securement to a wearer''s head.
Claim 8
Dependent Claim
59 words
The combination as set forth in claim 8 wherein said spectacle-type arrangement carries said housing and said beam splitter in fixed relation, said housing extending parallel with said earpieces above the plane of said earpieces; said aperture facing downward; said beam splitter extending across the line of incidence at an angle thereto, and below said aperture in said housing.
References Cited (Backward Citations)
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Cited
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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) | 1974-04-12 | 1974-10-12 | 1975-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-12 | 1978-10-12 | 1979-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-12 | 1982-10-12 | 1983-04-13 | $7700.00 | Window Closed / Lapsed |