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:
Dec. 29, 1987
Filed:
Sep. 19, 1985
Applicant:
Inventors:
William P Wohlford, Bettendorf, IA (US);
LaVern B Hovenga, Davenport, IA (US);
Assignee:
Deere & Company, Moline, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G08B / ;
U.S. Cl.
CPC ...
340568 ; 340666 ;
Abstract
A supervisory system includes a plurality of remote sensing units for positioning under the weight of an item to be monitored. The sensor unit includes a resistor connected in parallel with a switch which is held open by the weight of the article, but which will close when the article is removed from the sensor unit. A cable connects each sensor unit to a monitoring circuit which includes a DC potential source, a square wave generator, an impedance network, a comparator circuit and an alarm signal generator. The comparator circuit activates the alarm signal in response to certain changes in the sensor unit or in the cable.