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. 03, 1976
Filed:
Feb. 24, 1975
Applicant:
Inventors:
Clarence L Bennett, Jr, Groton, MA (US);
Carl E Bohman, Sudbury, MA (US);
Assignee:
Sperry Rand Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A01D / ;
U.S. Cl.
CPC ...
56 102 ; 130 / ; 324 41 ; 3402 / ; 56DI / ;
Abstract
A static magnetic field detector for harvesting machines senses the passage of ferrous or magnetic objects utilizing a balanced magnetic field excitation configuration which provides substantial self-cancellation of spurious background signals. A novel filtering means provides normalization of the fluctuations in the background noise due to the variations in the angular velocity of the rotating harvesting machine components. Additionally, the detector apparatus is disposed within a compressor feed roll of the machine thereby reducing the area which must be scanned and increasing the sensitivity of the device.