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:
Jun. 11, 1991
Filed:
Feb. 02, 1990
Francis M Miller, Clearwater, FL (US);
Conax Florida Corporation, St. Petersburg, FL (US);
Abstract
A circuit for operating a load in response to predetermined external conductivity conditions comprising a pair of sensing electrodes, a source of electrical energy connected to one of the electrodes, a load connected to the other of the electrodes, a controlled switch connected to the load, a first energy storage branch having a timing chracteristic and connected between the source and the other electrode, a second energy storage branch having a timing characteristic and connected across the combination of the load and a controlled switch, and a control operatively connected to the first and second branches and connected in controlling relation to the controlled switch so that when the electrodes are exposed to a first medium having a predetermined electrical conductivity energy builds up on first and second branches and the controlled switch is open and then a predetermined time after the electrodes are exposed to a second medium having a different electrical conductivity the controlled switch is closed and the load is operated by energy stored in the second branch. The first and second energy storage branches have different timing characteristics, and the predetermined time is a function of that difference. The control and its connection in the circuit are determined so as to be responsive to the first medium being of higher electrical conductivity than the second medium, for example, water being the first medium and air the second. The load can be an electro-explosive device of an automatic release mechanism for an aviator helmet.