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:
Feb. 28, 1989
Filed:
May. 05, 1986
Robert J Champetier, Torrance, CA (US);
Hughes Aircraft Company, Los Angeles, CA (US);
Abstract
Contamination, either in the form of particulate matter (46), e.g., dust and non-wetting liquid, or surface discontinuities (48), such as a smooth film or cratering, is collected on an explosed glass plate (12). Illumination at an angle incident with respect to a surface (14) of the glass plate causes the particulate matter to scatter light. A further light source illuminates the inside volume of the glass, causing light to scatter from the surface discontinuities. Either source of light scattering is detected by an optically sensitive detector (18) positioned beneath the glass plate. A bandpass filter (24) between the glass plate and the detector rejects spurious radiation.