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. 04, 1978
Filed:
Apr. 29, 1976
Hartmut Krause, Erlangen, DT;
Ulrich Grassme, Nuremberg, DT;
Siemens Aktiengesellschaft, Berlin & Munich, DT;
Abstract
A dental X-ray diagnostic device for the preparation of X-ray film pictures in which an X-ray radiation element is located exterior to the patient. A film holder is inserted into the mouth of the patient, and means is provided for setting the exposure time for switching off the X-ray tube high voltage upon reaching the dosage corresponding to optimum blackening of the film. An automatic exposure arrangement measures the exposure time and has a radiation detector attached to the film holder which is connected to a wireless transmitter. An antenna connected to a receiver, receives the transmitted signals and controls the switching circuit for switching off the X-ray high voltage supply. The transmitter is preceded by an integrator for a signal corresponding to the detector signal. A threshold switching circuit has a threshold selected so that upon reaching the dosage corresponding to optimum film blackening, it switches and applies a control signal to the transmitter.