The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 11, 1981
Filed:
Jun. 25, 1979
William W Carson, Mendon, MA (US);
Waters Associates, Inc., Milford, MA (US);
Abstract
Apparatus of the type including a light source directing a light beam through a measurement zone to a detector, wherein movement of the beam in a measurement direction with respect to the detector gives an indication of the measurement made in the zone, the improvement wherein the position of the beam with respect to the measurement zone is modulated through a preselected amplitude in a modulation direction, the amplitude being independent of light beam movements at the light source or in the path of the beam between the source and the modulating means, whereby the measurement can be made substantially independent of the beam movements in the modulating direction.