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US3754866A Expired / Lapsed US ⏱️ 0.0 years remaining

Optical detecting system

Assignee: Sherwood Medical Co
•
Filing: 1971-07-30
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Granted: 1973-08-28
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Expires: 1991-07-30
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Abstract

Abstract A testing apparatus for automatically determining prothrombin times and other similar factor assays. A turntable conveyor moves successive blood plasma samples in containers to a test station where each sample is tested, pertinent information sensed and fed to a printer for readout. Preliminary to the testing station is a first reagent dispenser where a reagent is dispensed to each sample and a second reagent dispenser is located at the testing station for adding a second reagent. Intermediate the two reagent dispensers is a sample incubation device which intimately contacts each container to apply heat thereto to incubate the sample contained therein. Each reagent dispenser is provided with a reagent reservoir and associated magnetic stirring system. A unique system for decoupling the magnetic stirring system from a magnetic stirrer and moving the magnetic stirrer out of the path of a pipette forming part of each reagent dispenser is provided. At the testing station, a unique photosensitive detection device is provided for sensing the formation of clots after the second reagent is added.

Inventors

  • 👤 D Ritchie
  • 👤 R Reeves

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-23 18:48
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/25; G01N21/255

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 67 words
The optical detecting system of claim 1 wherein said collimation means are on said other side of said path; and said system further includes an optical filter interposed between said light source and said photosensitive element for permitting detection at only certain wavelengths. 3.The optical detecting system of claim 1 wherein said collimated means comprises a collimated hole structure, and said diffuser means comprises a light pipe.
Claim 2
Dependent Claim 34 words
The optical detecting system according to claim 1 wherein said photosensitive element has a light sensitive surface facing in a direction substantially transverse to the direction of the light passing through said collimation means.
Claim 3
Dependent Claim 149 words
A detecting system for coagulation time testing apparatus comprising: means defining a testing station for receiving a transparent, sample-containing cuvette; a light source located on one side of said station; a filter interposed between said station and said light source; mask means on the other side of said station to permit light passing through a cuvette from said light source to pass therethrough and to substantially prevent ambient light from passing therethrough; a diffuser adjacent said mask means; and a photosensitive element operatively associated with said diffuser for receiving filtered light from said light source passing through said sample, said mask and said diffuser, said diffuser diffusing light passing through said mask and conducting light to said photosensitive element as an average quantity of light passing through the sample, whereby a signal from said photosensitive element may be employed as indicative of a particular optical condition of the sample.
Claim 4
Dependent Claim 15 words
The detecting system of claim 5 wherein said filter is a red, high pass filter.
Claim 5
Dependent Claim 28 words
The detecting system of claim 5 wherein said diffuser comprises an elongated light pipe and said photosensitive element is arranged transversely to the elongated axis of said pipe.
Claim 6
Dependent Claim 15 words
The detecting system of claim 7 wherein said mask means comprises a collimated hole structure.
Claim 7
Dependent Claim 158 words
A detecting system for a testing device comprising: means defining a testing station for receiving a transparent sample-holding container; a light source located on one side of said station, said light source including a bulb having an integral lens directed toward said station whereby a beam of light comprised of a plurality of substantially parallel rays is directed toward said station; a mask on the other side of said station aligned with said beam, said mask comprising a collimated hole structure; a diffuser adjacent said mask for diffusing light from said source passing through said mask; and a photosensitive element optically associated with said diffuser for sensing the quantity of light passing through said sample, said diffuser acting to conduct light to said photosensitive element as an average quantity of light passing through a sample at the testing station whereby localized variations in the optical conductivity of the sample are averaged to eliminate the effects of optical noise.
Claim 8
Dependent Claim 26 words
The optical detecting system of claim 9 wherein said diffuser comprises an elongated light pipe and said photosensitive element faces a side of said light pipe.

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) 1976-08-27 1977-02-26 1977-08-28 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1980-08-27 1981-02-26 1981-08-28 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1984-08-27 1985-02-26 1985-08-28 $7700.00 Window Closed / Lapsed

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