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:
Jan. 25, 1994
Filed:
Apr. 07, 1992
Dennis D Hayes, Lancaster, CA (US);
Warren W Welcome, Tucson, AZ (US);
Other;
Abstract
A mechanism/device (29) in association with a radiographic cassette (20) in which X-ray film (28) or the like is exposed. Upon exposure, an LED (39) continually blinks, indicating exposure to the user, thereby obviating double exposure of the film. A test and reset circuit (80) informs the user at any time of the operational status of device (29). Device (29) comprises a sensor (30), a photodiode (47), a conduit formed by a bundle (31) of optical fibers which conveys light energy from sensor (30) to photodiode (47) that converts it into an electrical current controlled by an electronic circuit (35) which includes LED (39). Circuit (35) includes a detecting and amplifying circuit (51), an oscillating circuit (68), a latching circuit (65) for maintaining blinking of LED (39), and the test-and-reset circuit (80).