US4135100A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for detecting concentration of liquid
Assignee: Konica Minolta Inc
•
Filing: 1977-08-02
•
Granted: 1979-01-16
•
Expires: 1997-08-02
Abstract
Abstract A method and apparatus is disclosed for determining the concentration of a liquid. A net or lattice screen member is dipped into a liquid and pulled out therefrom. Light rays are then transmitted through a liquid curtain formed on the net or lattice screened member in order to optically determine the concentration of said liquid.
Inventors
- 👤 Yoshiaki Harada
- 👤 Kazuo Okamura
- 👤 Masahiro Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:35
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/17; G01N21/59; G01N21/84; G01N21/85; G03; G03G; G03G15/00; G03G15/06; G03G15/10; G03G15/104; G03G15/105
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
61 words
A method for detecting concentration of liquid which comprises dipping a net or lattice screen member in the liquid of which concentration is to be measured, pulling out the screen member from the liquid, and transmitting light rays through a liquid curtain formed on a net or lattice of the screen member, to thereby detect optically the concentration of the liquid.
Claim 2
Independent Claim
61 words
A method for detecting concentration of liquid which comprises dipping a net or lattice screen member in the liquid of which concentration is to be measured, pulling out the screen member from the liquid, and transmitting light rays through a liquid curtain formed on a net or lattice of the screen member, to thereby detect optically the concentration of the liquid.
Claim 3
Independent Claim
90 words
An apparatus for detecting concentration of liquid which comprises a detecting cell for containing therein the liquid of which concentration is to be measured, a net or lattice screen member having a liquid curtain-forming portion, driving means for driving said screen member so that the liquid curtain-forming portion of said screen member is dipped in the liquid in the detecting cell and then pulled out from the liquid, and a light source and a photoelectric converter element which are disposed to confront each other with the screen member interposed therebetween.
Claim 4
Independent Claim
90 words
An apparatus for detecting concentration of liquid which comprises a detecting cell for containing therein the liquid of which concentration is to be measured, a net or lattice screen member having a liquid curtain-forming portion, driving means for driving said screen member so that the liquid curtain-forming portion of said screen member is dipped in the liquid in the detecting cell and then pulled out from the liquid, and a light source and a photoelectric converter element which are disposed to confront each other with the screen member interposed therebetween.
Claim 5
Dependent Claim
117 words
An apparatus as set forth in claim 2 wherein said screen member is provided with a space portion in an alternate relation with said liquid curtain-forming portion and further comprising a discriminator circuit for discriminating an output of said photoelectric convertor to provide a first electric signal associated with said liquid curtain-forming portion of said screen member and a second electric signal associated with said space portion of said screen member; two sampling holder circuits for holding said first and second electrical signals; a subtraction circuit for providing difference between said first and second signals and a concentrated developer replenishing device adapted to be actuated when the output of said subtraction circuit decreases below a predetermined level.
Claim 6
Dependent Claim
67 words
An apparatus as set forth in claim 2 wherein a space portion not forming a liquid curtain is formed on said screen member and a measurement circuit including a comparator for comparing an electric signal corresponding to the quantity of light rays transmitted through the liquid curtain-forming portion with an electric signal corresponding to the quantity of light rays transmitted through the space portion is further provided.
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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |