Patent US3739174A successfully refreshed from Google Patents.
US3739174A
Expired / Lapsed
US
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Integrating electromagnetic beam position sensor
Assignee: AT&T Inc
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Filing: 1971-01-04
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Granted: 1973-06-12
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Expires: 1991-01-04
Abstract
Abstract Quadrant-type spatially-integrating beam position sensors are disclosed that extend across a transverse section of an optical waveguide. These sensors intercept a fraction of the optical beam energy therein either along two orthogonal lines through the optical beam or throughout a cross section of the beam.
Inventors
- 👤 D Gloge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:16
CPC Classifications
H; H04; H04B; H04B10/00; H04B10/25; H04B10/2507
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
66 words
In combination; means for guiding a beam of electromagnetic wave energy along a given wavepath; a beam position sensor comprising: a transparent, photoconductive sheet extending transversely across said wavepath; and four contacting wires symmetrically distributed about the circumference of said sheet; means responsive to signals generated by said sensor for repositioning said beam within said wavepath; and means for coupling said wires to said repositioning means.
Claim 2
Dependent Claim
66 words
In combination; means for guiding a beam of electromagnetic wave energy along a given wavepath; a beam position sensor comprising: a transparent, photoconductive sheet extending transversely across said wavepath; and four contacting wires symmetrically distributed about the circumference of said sheet; means responsive to signals generated by said sensor for repositioning said beam within said wavepath; and means for coupling said wires to said repositioning means.
Claim 3
Dependent Claim
31 words
The combination of claim 1 wherein the four wires extend equal distances from the circumference of the photoconductive sheet toward its center but are not in electrical contact with each other.
Claim 4
Dependent Claim
16 words
The combination of claim 2 wherein said sheet is located on the surface of a lens.
Claim 5
Dependent Claim
16 words
The combination of claim 1 wherein said sheet is located on the surface of a lens.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |