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US4867908A Expired / Lapsed US ⏱️ 0.0 years remaining

Method and materials for calibrating flow cytometers and other analysis instruments

Assignee: Becton Dickinson and Co
•
Filing: 1987-06-04
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Granted: 1989-09-19
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Expires: 2007-06-04
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Abstract

Abstract A method for calibrating an instrument for using that instrument to obtain at least one light-related signal from particles under analysis comprises directing an incident beam of light at calibration particles having one or more known characteristics related to the particles expected to be analyzed. Both a light signal and a noise signal from the calibration particles are detected. A measurement is made of the ratio of the detected light signal to the detected noise signal, and that measurement is reported. The measured ratio is then compared to a predetermined ratio which represents a threshold for minimum instrument performance. This method further includes adjusting, if the predetermined ratio has not been attained, the operation of the instrument, while the calibration particles are within the incident beam of light, until the measured ratio reaches the predetermined ratio whereby the instrument is calibrated for subsequently obtaining the light signal from particles to be analyzed. A kit of reagents for use in calibrating an instrument for performing two-color analysis of particles and particle standars for calibrating fluorescence analysis instruments are also part of the instant invention.

Inventors

  • 👤 Diether J. Recktenwald
  • 👤 Rickie S. Kerndt
  • 👤 Michael R. Loken
  • 👤 Chia H. Chen

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 19:27
CPC Classifications
G; G01; G01N; G01N15/00; G01N15/10; G01N15/1012; G01N15/14; G01N15/1456; G01N2015/1006; G01N2015/1014; G01N2015/1477; Y; Y10; Y10T; Y10T436/00; Y10T436/10; Y10T436/101666; Y10T436/105831

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 20 words
Particle standards for calibrating fluorescence analysis instruments comprising biotinilated osmiumtetroxide-fixed chicken red blood cells and which include an avidin-fluorophore conjugate.
Claim 2
Dependent Claim 20 words
Particle standards for calibrating fluorescence analysis instruments comprising biotinilated osmiumtetroxide-fixed chicken red blood cells and which include an avidin-fluorophore conjugate.
Claim 3
Dependent Claim 13 words
The standards of claim 1 wherein the fluorophore of the conjugate is phycoerythrin.
Claim 4
Dependent Claim 13 words
The standards of claim 1 wherein the fluorophore of the conjugate is fluorescein.
Claim 5
Dependent Claim 13 words
The standards of claim 1 wherein the fluorophore of the conjugate is allophycocyanin.
Claim 6
Dependent Claim 13 words
The standards of claim 1 wherein the fluorophore of the conjugate is rhodam
Claim 7
Dependent Claim 14 words
The standards of claim 1 wherein the fluorophore of the conjugate is Texas red.

References Cited (Backward Citations)

US3406121A Cited
US3632735A Cited
US3640896A Cited
US4324686A Cited
US4436821A Cited
US4751188A Cited
US4767206A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-09-18 1993-03-20 1993-09-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-09-18 1997-03-20 1997-09-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-09-18 2001-03-20 2001-09-19 $7700.00 Window Closed / Lapsed

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