US3900266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting solid substances contained in liquid
Assignee: Eisai Co Ltd
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Filing: 1973-10-25
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Granted: 1975-08-19
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Expires: 1993-10-25
Abstract
Abstract Method and apparatus for detecting and measuring solid alien substance(s), which may adversely exist in a liquid contained in a transparent container, are provided. Light is applied to the container as it is rapidly rotated and then suddenly stopped to cause floating or suspending the solid substance(s) in the liquid. The light passed through the liquid or the passed through light and also the light reflected from the solid substance(s) are separately captured and their individual intensities are measured by means of photometry. The method and apparatus may be utilized for sorting out the transparent liquid from that contaminated with solid impurity, depending upon the intensity(s) of the captured light or lights.
Inventors
- 👤 Toshio Takahashi
- 👤 Ryosaku Tagaya
- 👤 Toshiyasu Ehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:45
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/84; G01N21/88; G01N21/90; G01N21/9018; G01N21/9027; D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/59; D06M15/592; G01N33/00; G01N33/0078; G01N33/0081
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
113 words
A method for detecting foreign solid matter that might exist as an impurity in a transparent liquid enclosed in a sealed transparent vessel by measuring intensity of the light passed through the liquid, comprising the steps of rotating said sealed vessel and then suddenly stopping the rotation of the vessel to cause the solid matter to swirl up in a rotary movement in the column of the still moving liquid; projecting light through said liquid in the vessel; capturing the light of reduced intensity passed through the liquid by means of a line-scanning photometric element provided with multiple minute areas for receiving said transmitted light; and measuring the intensity of the captured light.
Claim 2
Independent Claim
113 words
A method for detecting foreign solid matter that might exist as an impurity in a transparent liquid enclosed in a sealed transparent vessel by measuring intensity of the light passed through the liquid, comprising the steps of rotating said sealed vessel and then suddenly stopping the rotation of the vessel to cause the solid matter to swirl up in a rotary movement in the column of the still moving liquid; projecting light through said liquid in the vessel; capturing the light of reduced intensity passed through the liquid by means of a line-scanning photometric element provided with multiple minute areas for receiving said transmitted light; and measuring the intensity of the captured light.
Claim 3
Independent Claim
163 words
An apparatus for detecting solild foreign matter that might exist as an impurity in a transparent liquid enclosed in a sealed transparent vessel, comprising, in combination, a driven block for supporting a sealed transparent vessel and adapted for rotating and then suddenly stopping the rotation of the vessel supported thereon; a condensing lens adjacent the position of a vessel on said driven block; a light source for projecting a light onto said vessel through said condensing lens; a focussing lens for receiving the light passing through the liquid, the light having a reduced intensity when there is present in the vessel of any solid matter; a line-scanning photometric element provided with multiple minute areas extending from one end of the vessel to the other for receiving the said focussed transmitted light; and means for scanning the multiple areas for the light received thereby; and an element coupled to said photometric element for measuring the intensity of the light in the respective minute areas.
Claim 4
Independent Claim
163 words
An apparatus for detecting solild foreign matter that might exist as an impurity in a transparent liquid enclosed in a sealed transparent vessel, comprising, in combination, a driven block for supporting a sealed transparent vessel and adapted for rotating and then suddenly stopping the rotation of the vessel supported thereon; a condensing lens adjacent the position of a vessel on said driven block; a light source for projecting a light onto said vessel through said condensing lens; a focussing lens for receiving the light passing through the liquid, the light having a reduced intensity when there is present in the vessel of any solid matter; a line-scanning photometric element provided with multiple minute areas extending from one end of the vessel to the other for receiving the said focussed transmitted light; and means for scanning the multiple areas for the light received thereby; and an element coupled to said photometric element for measuring the intensity of the light in the respective minute areas.
Claim 5
Dependent Claim
18 words
An apparatus as claimed in claim 2 wherein the line-scanning photometric element is a line-scanner of optical fibers.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |