U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Icon_funbox Quotables

"It is my heart-warmed and world-embracing Christmas hope and aspiration that all of us, the high, the low, the rich, the poor, the admired, the despised, the loved, the hated, the civilized, the savage (every man and brother of us all throughout the whole earth), may eventually be gathered together in a heaven of everlasting rest and peace and bliss, except the inventor of the telephone. "

Mark Twain ; Christmas greetings, 1890

Newsletter  PatentStorm News

Make the Most of Our Site

See this month's Top Inventors and Most Cited Patents.

Stay on top of the latest innovations by subscribing to an RSS feed.

Registered users: Manage your profile.

 

Class 356/448 - By comparison


Subclass of Class 356 - Optics: measuring and testing
Definition: Subject matter including visual or photoelectric apparatus
No. of patents: 254
Last issue date: 03/13/2012


            7  
NumberTitleIssue Date
4029419Textile color analyzer calibration
A spectrophotometer is operative to measure or analyze the colors of materials such as textiles. A test sample is held by a holder and is illuminated by polychromatic light. Diffuse light reflected from the sample is collected and converted to variable mo...
06/14/1977
4029420Light reflectance instrument
An instrument for measuring light reflectance from fabric and the like materials which have a heterogeneous surface configuration includes an aperture defining a sensing area, three light sources for illuminating the sensing area, and a photoelectric cell...
06/14/1977
4017188Surface profile measuring device and method
An arrangement for measuring the profile of surfaces having a characteristic one-directional lay with sufficient resolution to determine the surface roughness thereof is disclosed, comprising a device for illuminating a small spot on the surface, with an ...
04/12/1977
4012141Identification of gemstones by relative reflectance measurements coupled with a scale calibrated in gem names
This invention embodies a novel concept in the confirmation of the identification of faceted gemstones and an instrument which makes this concept practical and useful. The concept is that it is not necessary to determine the refractive index (nD
03/15/1977
4003660Sensing head assembly for multi-color printing press on-line densitometer
A sensing head assembly for a multi-color printing press on-line densitometer movably mounted on support members that extend across the width of a printed web of paper that has printed thereon, in addition to the printed matter being monitored, a pluralit...
01/18/1977
3999864Gloss measuring instrument
An instrument for measuring the gloss of test samples at different predetermined angles of incidence, includes a glossimeter head operative to receive polychromatic light and direct it along plural beams at different angles of incidence towards an area on...
12/28/1976
3977789Scanning differential photoelectric autocollimator
An apparatus is disclosed which automatically measures the geometrical deviations of a reflecting surface from a reference surface, and which also can be used to automatically measure the deviations of some light beam deviating property of a transparent a...
08/31/1976
3971666Process for recycle of asphalt-aggregate compositions
A process for recycling asphalt-aggregate compositions comprises heating pieces of the used composition to form a semi-fluid or viscous composition, detecting the composition's asphalt deficiency and adding the proper amount of make-up asphalt. The compos...
07/27/1976
3970393Automatic compensation for densitometer imbalance
A method for compensating measurements of optical density of ink printed by a printing press in which amounts of light reflected from a printed test patch area and from an adjacent unprinted reference area are measured. The measurement sensitivity of sens...
07/20/1976
3970394Densitometer head with fiber optics
Densitometer head having a light source and optics for directing light onto a surface, optics and transducers for receiving and sensing light reflected from the surface, and external connections to signal processing circuitry. Fiber optics are used to rec...
07/20/1976
3960077Printing with blanket having recessed portion
In an offset lithographic printing machine a recess is provided in the offset blanket in a position such that when the recess is at the nip between the blanket cylinder and the printing plate cylinder the recess is in registry with a part of the non-print...
06/01/1976
3947088Interface for light probe
A viscous light transmissive fluid material, such as glycerine or the like, is applied to the solid end portion of a light conducting member of a light probe for optically coupling the latter with a sample having an irregular glossy surface. The fluid int...
03/30/1976
3942360Method and apparatus for measuring the degree of contamination of liquids
Liquid containing contaminants is passed through a lamination of a plurality of filter papers and the quantities of the contaminants deposited on upper and lower filter papers are compared with each other to determine the degree of contamination of the li...
03/09/1976
3938891Apparatus for detecting changes in a natural ocean wave pattern
An apparatus and method for detecting deviations from a normal ocean wave pattern which may be caused by interference with artificially created wave patterns, such as from an underwater moving vehicle. A camera mounted in an aircraft has its optic axis ve...
02/17/1976
            7  
 
Sign InRegister
Username  
Password   
forgot password?