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:
Aug. 06, 1985
Filed:
May. 09, 1983
John B Thatcher, Rohnert Park, CA (US);
Other;
Abstract
A swimming pool alarm in the form of an inexpensive compact unit which floats on the water in a swimming pool and which may be anchored to the side of the pool. The unit includes a hollow tubular probe which extends down below the surface of the water in the pool. The probe has an open bottom and a top closed by a flexible metal diaphragm. A piezoelectric ceramic member is attached to the upper surface of the diaphragm, and it serves to detect movements of the diaphragm in response to pressure changes in the air trapped in the upper portion of the probe. An electric circuit is connected to the piezoelectric ceramic member to activate and latch an electric alarm when the air pressure exceeds a predetermined threshold indicating, for example, that wave action in the pool has exceeded a predetermined level due to the fact that someone has fallen into the pool.