Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
3M Co
Original Assignee
Minnesota Mining and Manufacturing Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minnesota Mining and Manufacturing CofiledCriticalMinnesota Mining and Manufacturing Co
Publication of ES359881A1publicationCriticalpatent/ES359881A1/en
An overhead head projector device including a source of light, a plate for supporting a slide containing projection images, a projection head, and a condensing lens for directing light from said source, through said plate, to said projection head, for projecting said images onto an observation screen, characterized by including, in a position comprised between said lens and said projection images, a glare reduction screen, intended to reduce intense glare in the position anticipated by an operator of the projector, without producing an equivalent reduction in the intensity of the projected beam. (Machine-translation by Google Translate, not legally binding)
ES359881A1967-11-141968-11-05A high head projector device. (Machine-translation by Google Translate, not legally binding)
ExpiredES359881A1
(en)