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:
Apr. 20, 1976
Filed:
Feb. 05, 1975
Theodore E Larsen, Edina, MN (US);
Detector Electronics Corporation, Minneapolis, MN (US);
Abstract
A device for determining that the optical surfaces through which radiation must travel from a hazardous area of radiation to a radiation detector are free from radiation absorbing material or radiation blocking material, the device including an enclosure for commonly housing both a source of and a detector of radiation while isolating the same from each other, preventing radiation transmission within the housing from the source to the detector, such enclosure defining a path for radiation emission from the source outwardly from the housing to a reflective surface or surfaces which surface or surfaces will redirect the radiation back to the detector through the same optical surfaces that radiation from the hazardous area must pass. The relective surface or surfaces may be integral with the enclosure or may be remotely located therefrom.