Patent US3562539A successfully refreshed from Google Patents.
US3562539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for scanning thin-layer and other chromatograms
Assignee: United States Department of Agriculture
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Filing: 1968-08-28
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Granted: 1971-02-09
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Expires: 1988-08-28
Abstract
Abstract An apparatus for scanning thin-layer and other chromatograms containing a fiber optic scanning head consisting of randomly mixed glass fibers, half of which conducts light to a small defined area of the chromatogram and half of which conducts the reflected light to a photo-sensing cell for recording of its response on a strip chart recorder. A second fiber optic head scans the blank area adjacent to the spots to correct for background differences on the plate or other chromatogram supporting means.
Inventors
- 👤 Morton Beroza
- 👤 Kenneth R Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:15
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/90; G01N30/95; G01N21/00; G01N21/17; G01N21/55; G02; G02B; G02B26/00; G02B26/08; G02B26/10; G02B26/103
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
33 words
The apparatus of claim 1 in which sliding means are attached to the scanning heads to facilitate sliding over the means for maintaining a constant distance between said heads and the adsorbent surface.
Claim 2
Dependent Claim
27 words
The apparatus of claim 1 in which the circuitry is a simple, four-arm Wheatstone bridge in which each of the photocells forms an arm of the bridge.
Claim 3
Dependent Claim
14 words
The apparatus of claim 1 in which the light source is an incandescent bulb.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 in which the light source is essentially monochromatic.
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |