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Class Information
Number: 356/234
Name: Optics: measuring and testing > Photometers > Light absorbing
Description: Subject matter including an optical light attenuating member or members in the optical path which is illuminated from a location whose light intensity is to be determined, the members being adjustable or selectively placed in the optical path to control the illumination reaching the eye, the purpose being in both cases to reduce the visible illumination to render the viewed object or indicia markings barely visible.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 6783705 |
Calibration medium for wavelength calibration of U.V. absorbance detectors and methods for calibration |
Aug. 31, 2004 |
| 6423249 |
Calibration medium for wavelength calibration of U.V. absorbance detectors and methods for calibration |
Jul. 23, 2002 |
| RE37412 |
Optochemical sensor and method for production |
Oct. 16, 2001 |
| 5986751 |
Atomic absorption photometer |
Nov. 16, 1999 |
| 5910837 |
Photomechanical transducer |
Jun. 8, 1999 |
| 5686996 |
Device and method for aligning a laser |
Nov. 11, 1997 |
| 5673113 |
Analysis device for the automatic grading of products, in particular of fruits or vegetables |
Sep. 30, 1997 |
| 5611998 |
Optochemical sensor and method for production |
Mar. 18, 1997 |
| 5329350 |
Measuring laser beam parameters using non-distorting attenuation and multiple simultaneous samples |
Jul. 12, 1994 |
| 5270872 |
Superconducting submicron filter |
Dec. 14, 1993 |
| 5206118 |
Acid-sensitive leuco dye polymeric films |
Apr. 27, 1993 |
| 5161068 |
Superconducting searching filter |
Nov. 3, 1992 |
| 5155634 |
Superconducting reflection filter |
Oct. 13, 1992 |
| 5142418 |
Superconducting tunable inorganic filter |
Aug. 25, 1992 |
| 5107469 |
Digital low-power programmable alarm clock for use with reflectance photometer instruments and the like |
Apr. 21, 1992 |
| 5007717 |
Real time analyzer for pulsed laser systems |
Apr. 16, 1991 |
| 4729655 |
Device for shaping the angular response of a light meter or the angular emission of a light source |
Mar. 8, 1988 |
| 4431306 |
Method and apparatus for precision control of radiometer |
Feb. 14, 1984 |
| 4381148 |
Power meter for high energy lasers |
Apr. 26, 1983 |
| 4252440 |
Photomechanical transducer |
Feb. 24, 1981 |
| 4187026 |
Photoacoustic method and apparatus for measuring intensity of electromagnetic radiation |
Feb. 5, 1980 |
| 4130363 |
Laser dummy load |
Dec. 19, 1978 |
| 3942899 |
Calibrating device for light scatter photometering instrument |
Mar. 9, 1976 |
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