Patent US3418477A successfully refreshed from Google Patents.
US3418477A
Expired / Lapsed
US
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Apparatus for determining the focal point of a light beam
Assignee: GTE Sylvania Inc
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Filing: 1966-09-28
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Granted: 1968-12-24
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Expires: 1986-09-28
Abstract
No abstract record available.
Inventors
- 👤 Knutrud Thorleif
- 👤 Glenn H Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:07
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/28; G02B7/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
APPARATUS FOR LOCATING THE FOCAL POINT OF A COVERGING BEAM OF LIGHT COMPRISING A FIRST OPAQUE MEMBER HAVING A FIRST OPTICALLY SHARP EDGE, A SECOND OPAQUE MEMBER HAVING A SECOND OPTICALLY SHAPE EDGE, THE FIRST AND SECOND OPAQUE MEMBERS BEING ARRANGED SO THAT THE FIRST AND SECOND OPTICALLY SHARP EDGES DEFINE A SLIT, SCANNING MEANS FOR CAUSING THE COVERGING BEAM OF LIGHT TO SCAN ACROSS THE SLIT, THE FIRST OPTICALLY SHARP EDGE BEING LOCATED A FIRST DISTANCE FROM THE SECOND OPTICALLY SHARP EDGE ALONG THE AXIS OF THE LIGHT BEAM AND A SECOND DISTANCE FROM THE SECOND OPTICALLY SHARP EDGE IN THE DIRECTION OF SCAN OF THE SCANNING LIGHT, BEAM, AND DETECTING MEANS FOR DETECTING THE TIME REQUIRED FOR THE INTENSITY OF THE LIGHT PASSING BETWEEN THE FIRST AND
Claim 2
Dependent Claim
129 words
APPARATUS FOR LOCATING THE FOCAL POINT OF A COVERGING BEAM OF LIGHT COMPRISING A FIRST OPAQUE MEMBER HAVING A FIRST OPTICALLY SHARP EDGE, A SECOND OPAQUE MEMBER HAVING A SECOND OPTICALLY SHAPE EDGE, THE FIRST AND SECOND OPAQUE MEMBERS BEING ARRANGED SO THAT THE FIRST AND SECOND OPTICALLY SHARP EDGES DEFINE A SLIT, SCANNING MEANS FOR CAUSING THE COVERGING BEAM OF LIGHT TO SCAN ACROSS THE SLIT, THE FIRST OPTICALLY SHARP EDGE BEING LOCATED A FIRST DISTANCE FROM THE SECOND OPTICALLY SHARP EDGE ALONG THE AXIS OF THE LIGHT BEAM AND A SECOND DISTANCE FROM THE SECOND OPTICALLY SHARP EDGE IN THE DIRECTION OF SCAN OF THE SCANNING LIGHT, BEAM, AND DETECTING MEANS FOR DETECTING THE TIME REQUIRED FOR THE INTENSITY OF THE LIGHT PASSING BETWEEN THE FIRST AND
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-12-24 | 1972-06-24 | 1972-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-12-24 | 1976-06-24 | 1976-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-12-24 | 1980-06-24 | 1980-12-24 | $7700.00 | Window Closed / Lapsed |