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Class Information
Number: 250/565
Name: Radiant energy > Photocells; circuits and apparatus > Photocell controlled circuit > With circuit for evaluating a fluent material > With comparison
Description: Subject matter including a circuit or circuits for evaluating the relative output of two photocells, a photocell and a stored value or the photocell output sequentially as from a sample and standard.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6843102 |
Gas sensor arrangement |
Jan. 18, 2005 |
| 6359284 |
Scanner type fluorescence detection apparatus |
Mar. 19, 2002 |
| 5506685 |
Method and apparatus for determining the absorption of electromagnetic radiation by a gas |
Apr. 9, 1996 |
| 5400664 |
Apparatus for observing the suction of a sample having an automatic regulation fuction |
Mar. 28, 1995 |
| 5294806 |
Optical submicron aerosol particle detector |
Mar. 15, 1994 |
| 5237857 |
Down-hole liquid detecting apparatus |
Aug. 24, 1993 |
| 5206519 |
Constituent concentration indicator with a differentiator means and a signal conditioning means |
Apr. 27, 1993 |
| 5156012 |
Refrigerant charge detection system for an air conditioning system |
Oct. 20, 1992 |
| 5132096 |
Monitoring performance of a water treating agent by measuring and resolving optical voltage analogs |
Jul. 21, 1992 |
| 5092677 |
Photometer having a long lamp life, reduced warm-up period and resonant frequency mixing |
Mar. 3, 1992 |
| 5083036 |
Indicator circuit for a concentration measuring apparatus |
Jan. 21, 1992 |
| 5053623 |
Photometric analyzer for differential total reduced sulfur measurement by comparison with sample gas |
Oct. 1, 1991 |
| 4908676 |
Sensors for dissolved substances in fluids |
Mar. 13, 1990 |
| 4848904 |
Dual beam multichannel spectrophotometer with a unique logarithmic data converter |
Jul. 18, 1989 |
| 4759631 |
System for transmission loss comparison |
Jul. 26, 1988 |
| 4757306 |
Separation type light extinction smoke detector |
Jul. 12, 1988 |
| 4707133 |
Apparatus for plasma diagnostics |
Nov. 17, 1987 |
| 4651013 |
Smoke detector with changeable pulse light emitting interval for monitoring purposes |
Mar. 17, 1987 |
| 4638304 |
Environmental abnormality detecting apparatus |
Jan. 20, 1987 |
| 4637730 |
Optical and electronically compared absorptiometer |
Jan. 20, 1987 |
| 4586026 |
Infrared gas analyzer using count quadrature sampling |
Apr. 29, 1986 |
| 4579253 |
Toner control system |
Apr. 1, 1986 |
| 4559453 |
Smoke detector with a radiation source operated in a pulse-like or intermittent mode |
Dec. 17, 1985 |
| 4555634 |
Optical smoke detector with contamination detection circuitry |
Nov. 26, 1985 |
| 4547675 |
Smoke detector operating according to the radiation extinction principle |
Oct. 15, 1985 |
| 4537510 |
Output control device for light detectors for photometers |
Aug. 27, 1985 |
| 4525069 |
Optical absorption analyzer |
Jun. 25, 1985 |
| 4420256 |
Dust measurement |
Dec. 13, 1983 |
| 4374322 |
Apparatus for controlling the absorption of one or more color components in a dyeing fluid |
Feb. 15, 1983 |
| 4367041 |
Chromatograph detection system |
Jan. 4, 1983 |
| 4352553 |
Quality control copying apparatus |
Oct. 5, 1982 |
| 4350441 |
Photometric apparatus and method |
Sep. 21, 1982 |
| 4344429 |
Bubble detector with feedback circuit for improved sensitivity |
Aug. 17, 1982 |
| 4340307 |
Bichromatic spectrophotometer with wavelength reversal |
Jul. 20, 1982 |
| 4317113 |
Photoelectric smoke sensor |
Feb. 23, 1982 |
| 4309112 |
Rate measurement analyzer |
Jan. 5, 1982 |
| 4305659 |
Photometric apparatus and method |
Dec. 15, 1981 |
| 4303342 |
Method and apparatus for detecting foreign matters in liquids |
Dec. 1, 1981 |
| 4284412 |
Method and apparatus for automated identification and enumeration of specified blood cell subclasses |
Aug. 18, 1981 |
| 4257708 |
Apparatus for measuring the degree of rinsing |
Mar. 24, 1981 |
| 4257709 |
Automatic blanking circuit |
Mar. 24, 1981 |
| 4232967 |
Instrument for measuring sizes and quantity of particles in fluid medium |
Nov. 11, 1980 |
| 4212287 |
Insolation integrator |
Jul. 15, 1980 |
| 4185298 |
Process and apparatus for the automatic inspection of patterns |
Jan. 22, 1980 |
| 4166784 |
Feedback control for vacuum deposition apparatus |
Sep. 4, 1979 |
| 4128339 |
Automatically-adjusting photometer |
Dec. 5, 1978 |
| 4123665 |
Arrangement for determining the density of natural fog in the atmosphere |
Oct. 31, 1978 |
| 4111560 |
Method and apparatus for determining a property of a given substance |
Sep. 5, 1978 |
| 4087690 |
Spurious radiation compensation in infrared analyzers |
May. 2, 1978 |
| 4084906 |
Multigas digital correlation spectrometer |
Apr. 18, 1978 |
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